实用的分线电话机刘天虎在单位、家庭内部，一线多机是现在电话通信中普遍存在的问题，解决此类问题相继出现了许多新小部件来实现转接，但均因其操作、安装复杂而难以风行起来。本文介绍一种由北方科技实业公司开发研制的新颖分线电话机，只需简单地并接在电话线路上，就... Practical line telephones Liu Tianhu In the unit, the family, a multi-line machine is now a common problem in telephone communications, to solve such problems have emerged many new widgets to achieve the transfer, but both because of its operation, installation complexity And difficult to get popular. This article introduces a new technology developed by the Northern Industrial Branch developed a new telephone, simply connected to the phone line and ...