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1. 发明专利

AT42655B 未知
公开(公告)号：AT42655B
公开(公告)日：1910-06-25
申请号：AT42655D
申请日：1908-06-30
申请人： PETICKY JOSEF , CIZEK IVAN , SUCHANEK FRANTISEK
发明人： PETICKY JOSEF , CIZEK IVAN , SUCHANEK FRANTISEK

2. 发明专利

GB190911497A Device for Automatically Connecting Up the Subscribers of a Telephone Exchange. 未知
公开(公告)号：GB190911497A
公开(公告)日：1910-05-05
申请号：GB190911497D
申请日：1909-05-14
申请人： PETICKY JOSEF , SUCHANEK FRANTISEK , CIZEK IVAN
发明人： PETICKY JOSEF , SUCHANEK FRANTISEK , CIZEK IVAN
IPC分类号： H04M1/272
摘要： 11,497. Peticky, J., Suchßnek, F., and Cizek, I. May 14. [Addition to 28,036/04.] Automatic exchange systems. - In an automatic-exchange telephone system in which a connexion between the calling and called subscribers is established through a switch individual to the calling-line and through two co-ordinate selectors somewhat resembling the ordinary Strowger switches, the selection, as well as the actuation, of idle first and second selectors and connectors is effected by current impulses sent from the calling-station by the rotation of the impulsetransmitter, in a manner resembling that described in the parent Specification and in Specification 25,826/05. The speaking circuit includes one linewire with an earth return. Subscriber's impulse-transmitter. The clockwork-driven shaft 7, Fig. 1, carries four arms 6 having pivoted thereto four levers 2, 3, 4, 5, one arm of each of which carries sliding contacts 52 adapted to move over two sets of ten contacts 51, 53, while the other arm of each lever bears an extension 11 designed to engage respectively with one of four pins 16, 17, 18, 19 inserted in holes in the plate 250 according to the digits in the number of the subscriber wanted. The top row of holes 12 corresponds to "thousands," the second row 13 to "hundreds," and so on, and the pins 16, 17, 18, 19 are shown as inserted to call subscriber 4825, Fig. 1 being a back view of the apparatus. The clock-work is wound up by the depression of the lever 125, which, when it reaches its lowest position, engages a pin 128, and rocks the levers 127, 130 so as to move the latter lever away from an extension 131 on an arm 132 carried by the shaft 7. As the shaft rotates, the contact 52 on the lever 2 first passes over the ten contacts 51 sending over one line-wire intermittent currents which cause the subscriber's individual switch to select an idle first selector. The contact 52 then passes over the contacts 53, thereby sending currents over the other line-wire to actuate this first selector, until the extension 11 engages the pin 16, thereby rocking the lever 2 and raising the contact 52, which is kept in its raised position by a spring catch 10 until released by a trip 20. The contact 52 on the lever 3 now comes into action, passing over the contacts 51 and sending currents over the first line-wire to cause the first selector to find an idle second selector in the selected group. The contact 52 then moves over the contacts 53, sending currents over the second line-wire to operate this second selector, until the extension 11 on the lever 3 engages the pin 17, whereupon the lever 3 is rocked, and its contact 52 raised out of action. The contact 52 on the lever 4 similarly causes the selection of an idle connector and then its actuation to select the " tens " row containing the desired contact. The fourth lever 5 is reversed on its support, with the result that only the number of impulses is sent from the contacts 51 over the first line-wire which is necessary to select the desired contact in the selected row. The lever 5 and its contact 52 is shown broken away in Fig. 1, but it is similar to the other levers 2, 3, and 4. In the position for conversation, the shaft 7 is arrested by the engagement of an extension 134 with a pin 137 on a stirrup 135, pivoted at 136 and provided with a catch 138. During conversation, a hook 139 on the switchhook 140 engages the catch 138, and, on the hanging-up of the receiver, the stirrup 135 is rotated so as to release the extension 134, and the shaft 7 moves into its original position. The function of the contacts 80, 81, 82, 83 will be clear from the description of the system as a whole. Subscriber's individual switch at the exchange. The contacts 55, 57, 59, Fig. 18, are carried by a toothed sector 150, which is actuated by a magnet 21 through a lever 152 and a pawl 151. Each movement of the lever 152 closes a contact 85 in a test circuit, which is completed through a magnet 28 if the contacts 55, 57,59 are at that moment resting upon the terminals 54, 56, 58 of an idle first selector. The energizing of the magnet 28 breaks the circuit of the magnet 21, and so arrests the movement of the sector 150. The apparatus is returned to its zero position by a spring 155 when the pawls 151, 153 are raised by a lever 163 attached to the armature 259 of a release magnet 37, the circuit of which is completed by a relay 36, the contact 89 being maintained closed by a hook 164 until the sector has returned to its zero position. The function of contacts 86, 87, 88 will be explained later. Construction of selectors. The first and second selectors are identical in construction, and are similar to the connector, the principal differences being in the arrangement of the numerous contacts. Fig. 24 is a side elevation of a first selector. The moving contacts 61, 63, 65 are carried by a toothed segment 169 adapted to be turned about an horizontal shaft 167 by the magnet 22 through the lever 171 and pawl 170. The shaft 167 and the segment are carried by a framework 175 which is secured to a second toothed segment 176, mounted on a vertical shaft 168 and adapted to be rotated by the magnet 23. The sets of fixed contacts 60, 62, 64 are carried on a curved surface 166. Each movement of the pawl-lever of the horizontal segment 176 opens and closes a contact in a test circuit, which is completed through the magnet 30 if the terminals 61, 63, 65 are at that moment resting upon the terminals of an idle second selector. The energizing of the magnet 30 breaks the circuit of the magnet 23, aud thereby arrests the movement of the sector 176. The apparatus is returned to its zero position when the detents and actuating-pawls of the two segments are raised by a lever 191 connected to the armature of the release magnet 39, the circuit of which is completed by a relay 38, the contact 96 being maintained closed by a hook 193 until the vertical segment returns to its zero position. The function of the other magnets and contacts will be clear from the description of the system as a whole. General operation. Fig. 43 shows the operation of the system as a whole, S denoting the substation apparatus, Z the subscriber's individual switch at the exchange, ZWI and ZWII the first and second selectors, and V the connector. The battery leads for the batteries 120, 121, and 122 are repeated at the right side of each set of leads shown, an additional battery 123 and leads being shown on the extreme right of the Figure. Assuming that it is desired to call subscriber No. 4825, the pins 16, 17, 18, 19 are inserted in the corresponding holes, and the sub-station apparatus set in motion as previously described. At this stage, the contacts 80, 81, 83 are open and contact 82 is closed. Individual switch. As the contact 52 on the arm 2, Fig. 1, passes over the contacts 51, current impulses pass from the battery 120 through the contact 87, magnet 21, contacts 51, 50, and 82 to ground, thereby stepping the contacts 55, b7, 59 over the contacts 54, 56, 58, leading to the first selectors. The contact 85 is closed each time the magnet 21 is energized ; the contact 86 is closed when the magnet 28 is energized, and remains closed until the magnet 37 is energized ; and the contact 87 is opened when the magnet 28 has been energized and de-energized, and is closed again when the magnet 37 is energized. The contact 90 in an idle selector is normally closed, so that, as soon as connexion is made with an idle selector, current flows from the battery 121 through the contact 90, magnet 29, contacts 54, 55, magnet 28, and contact 85 back to the battery. This circuit is broken when the contact 85 is opened by the magnet 21, but the energizing and de-energizing of the magnets 28, 29 (a) opens the contact 90 so that the first selector tests 'engaged' to other subscribers, and (b) closes contact .86 and opens contact 87 in the circuit of the magnet 21 so that additional impulses from the calling station cannot influence the switch Z. First selector. When the contact 52 reaches the contacts 53, five impulses of current (one more than the 'thousands' digit) pass from the battery 120 through the magnet 22, contacts 92, 56, 57, 53, 50, 82 to ground and back to the battery. The contact 91 is closed when the vertical segment 169 leaves its zero position ; the contact 92 is opened when the horizontal segment 176 leaves its zero position; the contact 93 is closed by the magnet 30 and opened by the magnet 39; the contact 94 is opened when the magnet 30 has been energized and de-energized, and is closed again by the magnet 39 ; contact 97 is closed and opened each time the magnet 23 is operated. The magnet 22 operates the vertical segment, causing the contacts 61, 63, 65 to move to the row of contacts leading to selectors of the fourth thousands' group. The subsequent impulses sent by arm 3 pass over the contacts 51, 86, 55, 54, 91, closed by the movement of segment 169, magnet 23, and contact 94 to the battery 120. The contacts 61, 63, 65 are then moved by the magnet 23 until they engage the contacts of an idle second selector, whereupon current passes from the battery 121 through the contacts 98, magnet 31, contacts 60, 61, magnet 30, and contact 97 back to the battery. The energizing and de-energizing of magnets 31, 30 (a) opens contact 98, whereby the second selector tests 'busy' to other first selectors, and (b) closes contact 93 and opens contact 94, thus cutting-out the magnet 23 and preventing further actuation of the selector. Second selector. The selection of the row of terminals leading to connectors of the desired 'hundreds' group, and the selection of an idle connector in that group proceeds in exactly the same manner under the control of the contacts 53 passed over by the arm 3 and the contacts 51 passed over by the arm 4. Connector. During the movement of the arm 4 over the contacts 53, three impulses pass from the battery

3. 发明专利

AT28445B 未知
公开(公告)号：AT28445B
公开(公告)日：1907-05-10
申请号：AT28445D
申请日：1905-12-01
申请人： PETICKY JOSEF , CIZEK IVAN , SUCHANEK FRANTISEK
发明人： PETICKY JOSEF , CIZEK IVAN , SUCHANEK FRANTISEK

4. 发明专利

GB190428036A Means for Automatically Connecting Up with each other the Subscribers to Telephone Exchanges. 未知
公开(公告)号：GB190428036A
公开(公告)日：1905-12-21
申请号：GB190428036D
申请日：1904-12-21
申请人： PETICKY JOSEF , CIZEK IVAN , SUCHANEK FRANTISEK
发明人： PETICKY JOSEF , CIZEK IVAN , SUCHANEK FRANTISEK
IPC分类号： H04M1/272
摘要： 28,036. Peticky, J., Cizek, I., and Suchanek, F. Dec. 21. Telephone systems.-In an automatic exchange system, the subscribers' call apparatus at the exchange is designed to select a disengaged connecting-up apparatus, which seeks out the desired subscriber's line and makes the required connection. The number of connecting-up apparatus is determined by the number of conversations likely to be carried on at one time. Fig. 1 shows the apparatus at the subscriber's station, the same being shown diagrammatically in Fig. 28. The revoluble arm 3 carries contacts 4, 5, 6 over a number of contacts arranged in groups, of which the contacts 8 serve to operate the corresponding exchange call apparatus and thus select a connecting-up apparatus, the contact groups 9, 10, 11, 12 actuate this connecting-up apparatus to discover the required connection, the contacts 14, 20 make the speaking connection, and the contact groups 15, 16, 17, 18, 19 serve to bring the connecting - up apparatus back to its zero position when conversation is over. Each of the contact groups 9, 10, 11, 12 and 15, 16, 17, 18 is adapted to be covered by shields 21-28 so as to determine the number of operative contacts in their respective groups. If subscriber 2458 is to be called, three contacts in group 9, five in group 10, six in group 11, and nine in group 12 are uncovered, the extra contact in each group corresponding to the zero position on the connecting - up apparatus. The additional contacts 15 , 16 , 17 , 18 , 9 , 10 , 11 , 12 and the contacts 13, 19 are connected together, and serve to actuate the contact-device A in the connecting - up apparatus described later. The contacts 4, 5 are connected together but insulated from the contact 6. The contact groups 9-12 and 15-18 are connected together, and also to the contact 14 as shown in Fig. 28. When the arm 3 has moved through 180 degrees, it is held by a special stop-device shown in Fig. 5. When the arm 3 is against the second contact 13, it is arrested by a stop 36 on a pivoted lever 34, but, on removal of the receiver from the hook-lever 41, the lever 34 is moved in the direction of the arrow 38 and allows the arm 3 to fall against the stop 37, at the same time making the speaking circuit through the contacts 6, 14. When the receiver is hung up, the lever 34 is returned and the arm 3 continues its journey over the contacts 15-19. Fig. 8 shows the exchange call apparatus, comprising a contact-device and a lever mechanism. The contact-device consists of a wheel 45, actuated by the electromagnet 44 and carrying contacts 46 which slide over a fixed disc 47 having as many rows of contacts 48, 49, &c. as there are connecting- up apparatus. The lever mechanism comprises a movable lever 54 with contacts 55 ... 60 opposite contacts 62, 63, and 65 ... 68 on a second movable lever 61. The normal position of the contacts is shown in Fig. 8, but, when the lever 54 is attracted by the electromagnet 53, the contact 60 is broken and the others made. The levers 54, 61 are retained in this position by the lever 69, controlled by a magnet 70. This lever mechanism acts in conjunction with a similar mehanism, shown in Fig. 12, forming part of each connecting-up apparatus. The contact 79 of one connecting - up apparatus is connected with the contact 75 of the next, and so on. The connecting-up apparatus comprises contact-devices A, B, C, D, E, Fig. 23, and a number of contact-rods 82. The device A serves to connect up the electromagnets 90 ... 93 and 104 of the devices B, C, D, E, and of the rods 82 at the proper time. The contact-device A consists of a fixed disc 83 having a number of contacts, the function of which will appear later, and a lower movable disc having a row of contacts coupled in pairs so as to engage in succession the contacts on the disc 83 and connect them to their corresponding contact-rings 108, 109, &c. The contact devices B, C, D, E and rods 82 discover the required line, and are actuated in turn by the contact groups 9,10, 11, 12, Fig. 1. The devices C, E comprise fixed discs 118, 120, bearing one-hundred contacts 130, 125 and ten contacts 131, 126, beneath which are movable discs bearing contacts which serve to couple the contacts 131, 126 in turn with each of the ten contacts 130, 125 arranged near each contact 131, 126. The movable discs are actuated by electromagnets 91, 93. The contact-devices B, D each carry two groups 144, 138 of eleven contacts each, and also a contact-ring 139, which are in turn connected up by movable contacts on a disc rotated by the magnets 90, 92. The contacts 131, 126 on the devices C, E respectively, are connected in order to the contacts 144, 138 on the devices B, D. The contact-rods 82 serve for the actual connecting-up of the subscribers. Each rod carries onehundred contacts 151, and can be moved by the electromagnets 104 so as to engage one-hundred relative contacts 152 fixed underneath. The movable contacts are connected to the lines of the subscribers, so that there is one rod 82 for each hundred subscribers. The fixed contacts 152 are connected with the contacts 125 of the device E in such a way that the 1st, 101st, 201st, &c., fixed contacts are connected to the 1st contact 125, the 2nd, 102nd, 202nd, &c. contact to the 2nd contact 125, and so on. When the rods have been moved by the electromagnets 104 so that all the contacts engage with all the relative fixed contacts, the rod is held by a catch, which is removed when the electromagnet 105 is energized. Referring now to Fig. 28, let it be assumed that the contact groups 9 .. 12 are uncovered, as before explained, so as to call subscriber 2458. The arm 3 is allowed to rotate, and makes connection with the first contact of the group 8 and closes the circuit 156 from the battery 157, through contact 56 of the lever mechanism, electromagnet 44, the subscriber's call apparatus, and the arm 3 to earth. The wheel 45 of the exchange apparatus, Fig. 8, is thus rotated one step so that the contacts 46 engage the contacts 48, and, if these are in connection with a disengaged connecting-up apparatus, the circuit 158 is closed. If, however, the first connecting-up apparatus is engaged, the wheel 45 is rotated another step by the second contact in group 8, and so on until a suitable apparatus is found, and the circuit 158 of that apparatus is closed. This circuit passes from the battery 157 through the contacts 52 (closed by the magnet 44), magnet 53, contacts 46, 48 (or 49, 50, 51, &c.), magnet 74, and the contacts 76, 75 to the battery. The magnets 53,74 break the contacts 56, 76 so that the circuit 156 is no longer closed when the arm 3 passes over the succeeding contacts 8, but the contacts 57, 58, 59 are closed so that, when the arm 3 passes over the contact 9 , the circuit 159 is completed from the battery through the magnet 113, contacts 46, 48 (or 49 &c.), 58, 9 , and the arm 3 to earth. The magnet 113 is thus energized, and rotates the lower disc of the device A one step, so that the contact 86 makes the connections for actuating the device B. When the contact 4 comes in contact with the operative contacts in group 9, circuit 173 is successively completed from the battery through the contacts 103, 86, magnet 90, contact 109 in the device A, and the contacts 48 (or 49 &c.), 46, 57, 9, 4 to earth. The movable disc in the device B is thus turned as many steps as there are operative contacts 9. The arm 3 then connects with the contact 10 , closing the circuit 159 again and rotating the device A so as to make the connections for the device C. The operative contacts 10 then move this the required number of steps. In the same way, by the contacts 11 , 12 , the device A is rotated and makes the connections for the devices D, E, which are rotated by the operative contacts 11, 12. When the arm 3 passes over the first contact 13, the circuit 159 is again closed, and the device A is rotated so as to close the circuit 177 from the battery through the contacts 178, contacts 144, 130 already found in the devices B, C, magnet 104 corresponding to said contacts, and the contact 102 in the device A to the battery. The contact-rod 82, in this instance the 24th, is thus operated by the magnet 104 and closes all its hundred contacts. The device A is again rotated by the second contact 13 and completes the signalling-circuit 180. Current then flows from ground through the calling subscriber's telephone apparatus and automatic switch contact z of the calling-generator z, contacts 6, 14, 57, 46, 48 (or 49, 50, 51, &c.), contacts 109, 102 in the device A, and the contacts 138, 125 corresponding to the particular number on the devices D, E to the connection in the rod 82, from which the current passes to the line of the called subscriber (circuit 181) through contacts 60, 20, 6 to earth. Both subscribers remove their receivers, whereby the arm 3 moves so as to come against the tooth 36, Fig. 5. When the receivers are hung up, the arm 3 continues its journey over contacts 15 ... 18 and 15 , 16 , 17 , 18 , whereby the device A is continually rotated so as to make the necessary connections so that the devices B, C, D, E are returned to the zero position by the operative contacts 15 ... 18. When the arm 3 reaches the first contact 19. the circuit 184 is completed through the magnet 105 and contacts 103, 111 in the device A, thus returning the rod 82 to zero position. Contact of the arm 3. with the second tooth 19 closes the circuit 185 through the magnet 81, contacts 101, 110 in device A, and the contacts 115, whereby the lever mechanism in Fig. 12 is replaced. At the. same time the circuit 186 is closed by the contacts 77, 80 coming together, thus energizing the magnet 70 and replacing the lever mechanism in Fig. 8. Should an attempt be made to call an engaged subscriber, the movement of the devices B, C, D, E of the second connecting-up apparatus complete

5. 发明专利

AT25443B 未知
公开(公告)号：AT25443B
公开(公告)日：1906-08-25
申请号：AT25443D
申请日：1904-10-28
申请人： PETICKY JOSEF , CIZEK JVAN , SUCHANEK FRANTISEK
发明人： PETICKY JOSEF , CIZEK JVAN , SUCHANEK FRANTISEK

6. 发明专利

DK8844C 未知
公开(公告)号：DK8844C
公开(公告)日：1906-09-10
申请号：DK8844D
申请人： CIZEK IVAN , PETICKY JOSEF , SUCHANEK FRANZ
发明人： CIZEK IVAN , PETICKY JOSEF , SUCHANEK FRANZ

7. 发明专利

DK9267C 未知
公开(公告)号：DK9267C
公开(公告)日：1907-02-04
申请号：DK9267D
申请人： CIZEK IVAN , PETICKY JOSEF , SUCHANEK FRANZ
发明人： CIZEK IVAN , PETICKY JOSEF , SUCHANEK FRANZ

8. 发明专利

CH33515A Installation pour établir automatiquement au bureau central la communication entre deux abonnés d'un réseau téléphonique 未知
公开(公告)号：CH33515A
公开(公告)日：1905-12-31
申请号：CH33515D
申请日：1904-12-19
申请人： PETICKY JOSEF , SUCHANEK FRANZ , CIZEK IVAN
发明人： PETICKY JOSEF , SUCHANEK FRANZ , CIZEK IVAN

9. 发明专利

CH36229A Installation pour établir automatiquement au bureau central la communication entre deux abonnés d'un résequ téléphonique 未知
公开(公告)号：CH36229A
公开(公告)日：1906-12-31
申请号：CH36229D
申请日：1906-01-20
申请人： PETICKY JOSEF , SUCHANEK FRANZ , CIZEK IVAN
发明人： PETICKY JOSEF , SUCHANEK FRANZ , CIZEK IVAN

10. 发明专利

GB190525826A Improvements in and relating to Means for Automatically Connecting Up the Subscribers of Telephone Exchanges to each other. 未知
公开(公告)号：GB190525826A
公开(公告)日：1906-05-24
申请号：GB190525826D
申请日：1905-12-12
申请人： PETICKY JOSEF , CIZEK IVAN , SUCHANEK FRANZ
发明人： PETICKY JOSEF , CIZEK IVAN , SUCHANEK FRANZ
摘要： 25,826. Peticky, J., Cizek, I., and Suchanek, F. Dec. 12. Telephone systems.-Relates to improvements in the automatic exchange telephone system, described in Specification No. 28,036, A.D. 1904, for the purpose of reducing the number of contacts on the disks of the exchange call apparatus, and the number of contact-rods in each connecting apparatus. According to the present invention, the subscribers are divided into small groups of, say, one hundred subscribers each, and for each small group ten intermediate switch devices are provided, which are only accessible to the subscribers in the particular group. Ten of these small groups are combined to form a main group of one thousand subscribers, to which one hundred connecting-up apparatus are allotted, each of these being accessible to each of the thousand calling subscribers. Each connecting-up apparatus contains only ten contactrods, each for one hundred subscribers, thus serving one thousand called subscribers. Each main group is thus provided with a number of connecting-up apparatus for each thousand subscribers to the exchange, so that a calling subscriber selects in turn firstly a disengaged intermediate switch device, then that group of connecting up apparatus containing the thousands number of the required subscriber, and from this group a disengaged apparatus, which makes the final connexion as described in the prior Specification. Figs. 2 and 4 show two subscribers' call apparatus X and exchange apparatus Y, one intermediate switch device Z, and two connecting- up apparatus A, B, C, D, E. The two Figures are to be assembled side by side, the conductors H being repeated in each Figure. The subscriber's call apparatus X is provided with an additional set of contacts 253 between the contacts 9, 10, the use of which will appear later. The exchange call apparatus Y is similar to that in the prior Specification, but has only ten rows of contacts 48, 49, &c. connected to the intermediate switch device Z -each row to one switch device-which comprises a " thousands" contact-device B, lever mechanisms 54 , 71 , similar to lever mechanisms 54, 71 in the prior Specification, and a contact-device G. There are as many rows of five contacts 144 on the device B as there are thousands of subscribers, and each row of contacts is connected to a corresponding row of contact-segments 252 on the device G, each segment being associated with a number of individual contacts 250 equal in number to the number of connecting-up apparatus allotted to each contact row 144 of the device B. The contacts 250 are connected to the various connecting-up apparatus by way of the common conductors H. Bridgmgcontacts are adapted to connect the contacts 144 with the segments 144', and the contacts 250 with the segments 252 when the devices B, G, respectively, are rotated. The connecting-up apparatus is similar to that described in the prior Specification, except that the device A has only three contacts 87, 88, 89, to connect in the contact-devices C, D, E, and that the number of contact-rods 82 is only ten. When a subscriber is being called, the contact 4 moves over the contacts 8, closing the circuit of the magnet 44, so as to select a disengaged intermediate switch device Z as described in the previous Specification. The movement of the contact 4 over the " thousands " contacts 9 moves round the device B until the contacts 144' are connected by contacts 144 with the contact 252 of the desired " thousands " group of connecting-up apparatus. Contacts. 253 then rotate the movable contact-disk of the device G until it connects the contact 252 to a disengaged connecting-up apparatus in that group. The subscriber is then selected as in the prior case by the contacts 10 , 11 , 12 , actuating the device A which makes the necessary connexions for the devices C, D, E, to be rotated by the contacts 10, 11, 12, respectively. The first contact 13 rotates the device A one step farther to close the circuit of the selected magnet 104 so as to move the contact-rods 82 into position. The second contact 13 moves the device A to establish the calling circuit from earth at the subscriber's station, through the wire 501, calling generator z, switch hook, contacts 6, 14, contact 57 of the exchange mechanism, contacts 46, 49, contact 57 of the lever mechanism 54 , contacts 144 , 144 of the " thousands " device, contacts 252, 250 of the device G, -conductor H, contacts 109, 100 of the disengaged connecting up apparatus A, Fig. 4, the discovered contacts 138, 125 on the devices D, E, and the connexion in the contact-rod 82 to the called subscriber's line and apparatus. The apparatus is restored to its initial condition by means of the contacts 16, 16 , 17, 17 , 18, 18 , 19, as in the prior case.

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