| 摘要 |
<p>A telephone system such as an automatic inter-city system transmitting over land lines, has an impulse train relay, a deception relay for signals over land lines originating from remote locations and an occupation relay suppressing the readiness condition of the system. The system incorporates a receiver and transmitter employing special land lines, circuits of maintenance and local excitation of the reception relay and a supervision circuit. A complementary circuit is coupled to the system inputs and connection terminals enable the telephone circuit to interpret in an annalogons manner those signals received by archinery land line or the special land line.</p> |
