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    • 8. 发明授权
    • Remote testing of telephone loops
    • 远程测试电话环路
    • US4054760A
    • 1977-10-18
    • US709256
    • 1976-07-28
    • Dennis Howard Morgen
    • Dennis Howard Morgen
    • H04M3/30H04M1/24
    • H04M3/301
    • A telephone subscriber loop testing system is disclosed which can be used for performing standard ringer continuity, noise, leakage, short circuit, and foreign voltage tests over exceptionally long subscriber loops. The sensitivity of the ringer ballistic test is enhanced by placing the reversing switch (which serves to discharge the line) at a location remote from the central office test desk and relatively near to the subscriber station.In one embodiment, the remote ballistic test circuit is incorporated in a remote testing system for a group of subscriber lines connected to the central office through a carrier system. In this embodiment, a separate metallic test path is provided to the remote location which can be selectively connected to any one of a plurality of subscriber loops for such testing.
    • 公开了一种电话用户环路测试系统,其可用于在超长的用户环路上执行标准振铃器连续性,噪声,泄漏,短路和异常电压测试。 通过在远离中心局测试台的位置并且相对靠近用户站放置反向开关(用于排出线路)来增强振铃器弹道测试的灵敏度。
    • 10. 发明申请
    • TRAILER HITCH MIRROR
    • US20120050900A1
    • 2012-03-01
    • US13214212
    • 2011-08-21
    • Dennis Howard HelingGlen Clark Allan
    • Dennis Howard HelingGlen Clark Allan
    • B60R1/078
    • B60R1/078
    • A device aids the visual alignment of a ball on a hitch at the rear of a towing vehicle to a ball receiving socket on a tongue of a trailer. The device has a one-piece elongated member. The elongated member has a first end with a first flattened portion adjacent thereto and a second end with a second flattened portion adjacent thereto. The elongated member has a bend therein located between the two flattened portions. Two suction cups are attached to the first flattened portion of the elongated member. A mirror is attached to the second flattened portion of the elongated member. In a preferred embodiment each of the suction cups is associated with a stabilizer member.
    • 一种装置有助于将一个球在牵引车辆后部的搭接件上的视线对准到拖车舌头上的球窝座。 该装置具有单件细长构件。 细长构件具有第一端部,其第一扁平部分与其相邻,第二端部具有与其相邻的第二扁平部分。 细长构件具有位于两个平坦部分之间的弯曲部。 两个吸盘连接到细长构件的第一扁平部分。 镜子连接到细长构件的第二平坦部分。 在优选实施例中,每个吸盘与稳定器构件相关联。