Telephone ringing extender

Details Telephone ringing extender Telephone ringing extender

1978-01-30

1979-03-13

Cooper, William C.

H04Q 144

Patent

active

041444086

ABSTRACT:
A telephone ringing extender is shown which includes a ringing signal detector and a switch. In response to ringing signals, the ringing extender grounds the tip conductor to operate telephone ringers bridged on the loop. Protection against excessive voltages and excessive currents is also provided.

REFERENCES:
patent: 1719499 (1929-01-01), Bowne

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