Combined loud- and low-speaking telephone instrument having...

Details Combined loud- and low-speaking telephone instrument having... Combined loud- and low-speaking telephone instrument having...

H - Electricity

04

M

379/81

H04M 1/00 (2006.01) H04M 1/02 (2006.01) H04M 1/62 (2006.01)

Patent

CA 917328

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