Shared usage of key telephone system line circuits

Details Shared usage of key telephone system line circuits Shared usage of key telephone system line circuits

H - Electricity

04

M

344/18, 379/33

H04M 3/42 (2006.01) H04M 9/00 (2006.01) H04Q 3/00 (2006.01)

Patent

CA 910459

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