本文介绍了一种同线电话自动转接装置。
This paper introduces a kind of device that can transfer collinear telephones automatically.
首次使用同线电话和回复呼叫。印第安纳州南本德电话系统首次使用普通电池。
Earliest extended use of party lines and reverting calls. first system using common battery talking ( south bend, indiana )
首次使用同线电话和回复呼叫。印第安纳州南本德电话系统首次使用普通电池。
Earliest extended use of party lines and reverting calls. first system using common battery talking ( south bend, indiana )
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