Telephone acoustic amplifier

Details Telephone acoustic amplifier Telephone acoustic amplifier

H - Electricity

04

M

379/105, 181/18,

H04M 15/30 (2006.01) H04M 1/21 (2006.01) H04M 1/215 (2006.01) H04M 1/65 (2006.01) H04M 1/656 (2006.01)

Patent

CA 1022854

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