| 摘要 |
A tamperproof handset for use in railroad communication systems has a cable which interconnects it with a communications control panel. The transmitter end of the handset and a cap therefor have mating threads. A screw passes through a hole in the transmitter cap and tightens down onto the threaded peripheral surface of the transmitter end to prevent removal of the cap. A bushing having a flange and a threaded portion is received within a hole in the panel of the communication control. A nut screws onto the threaded portion of the bushing and secures the bushing to the panel. The cable passes through a hole in the bushing and is wired to appropriate terminals within the control.
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