Handsfree loudspeaking key telephone set and a switching...

Details Handsfree loudspeaking key telephone set and a switching... Handsfree loudspeaking key telephone set and a switching...

H - Electricity

04

M

379/33, 379/81,

H04M 9/00 (2006.01) H04M 1/60 (2006.01)

Patent

CA 997492

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