| 摘要 |
PROBLEM TO BE SOLVED: To facilitate wiring and control of illumination light fixtures and crime prevention cameras or the like, attached in the vicinity of an entrance interphone slave unit. SOLUTION: The slave unit 11, installed at an entrance and a gatepost or the like, is provided with a timer circuit 17 that is started at the closing of a master unit calling pushbutton switch 14 and activated for a prescribed time period and with a relay circuit 18 that closes its contacts to activate an ancillary device 3, while the timer circuit 17 is in operation.
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