Multi-party line emergency access device

Details Multi-party line emergency access device Multi-party line emergency access device

H - Electricity

04

M

379/3

H04M 11/06 (2006.01) H04M 11/04 (2006.01) H04Q 5/02 (2006.01)

Patent

CA 1240084

ABSTRACT An emergency access signalling device, for use with a multi-party telephone line, is activated by the change in the telephone line current occasioned by another subscriber to the line lifting his or her handset.

492741

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