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    • 121. 发明申请
    • Inside/outside scribe
    • 内/外划痕
    • US20050155235A1
    • 2005-07-21
    • US11077617
    • 2005-03-11
    • Robert Allen
    • Robert Allen
    • B25H7/04B26B29/06B43L7/00B43L13/02
    • B43L13/02B25H7/04B26B29/06B43L7/007E04F21/0076
    • The invention is an improved, hand-held, adjustable, graduated marking gauge and scribe for carpentry and related activities. It is used to mark work-pieces at a given distance from an adjacent edge or intersecting surface such as is encountered when fitting cabinets or trim to uneven wall surfaces, or in the spiling of boat planking or the marking of cut-outs relative to an edge. The device consists of a main body, upon which are marked scales and which is bent and formed at one end to create an edge follower and a corner follower and upon which is mounted a sliding and stoppable instrument holder which holds marking, cutting or other instruments, inserted therein, in an adjustable fashion. The displacement of the centre-line of the marking instrument relative to the edge follower or the corner follower is read on the scales at the corresponding cursor edge of the instrument holder.
    • 本发明是用于木工和相关活动的改进的手持式,可调节的刻度标尺和划线器。 它用于在距相邻边缘或相交表面一定距离处标记工件,例如在将机柜或装饰件安装到不平坦的墙壁表面时遇到,或者在船板的间隙或相对于 边缘。 该装置由主体组成,其上有标记的标尺,并且在其一端弯曲并形成,以形成边缘随动件和拐角随动件,并在其上安装有可滑动和可停止的仪器保持器,其保持标记,切割或其它仪器 以可调节的方式插入其中。 标记仪器相对于边缘跟随器或拐角跟随器的中心线的位移在仪器支架的相应光标边缘的刻度上读取。
    • 128. 发明授权
    • Electronic circuit for a speakerphone
    • 用于扬声器的电子电路
    • US4081622A
    • 1978-03-28
    • US737015
    • 1976-10-29
    • Jeremy ClarkRobert Allen
    • Jeremy ClarkRobert Allen
    • H04R3/02H04M1/60
    • H04R3/02
    • The invention relates to an electronic circuit for a speakerphone which, when in the balanced condition, will eliminate acoustic feedback as between the microphone and the speaker of the speakerphone. The arrangement consists of a bridge having four legs. Input from telephone lines are fed into the bridge between two adjacent points (i.e. across one leg) of the bridge. The microphone is connected between one of the input points and a point opposite to the one input point. The legs on either side of the opposite point of the microphone connection contain equal impedances, and the fourth leg, between the input leg and one of the equal impedance legs, contains a variable impedance. To balance the bridge, the variable impedance is adjusted such that the microphone signal, appearing in opposite sides of the bridge, will be canceled out and thereby prevented from exiting on the speaker circuits. However, because of the imbalance relative thereto, the microphone signal will be passed up the telephone lines. Again, because of a similar imbalance, input from the telephone lines will be fed out to the speaker circuits.