Audio frequency signalling systems for telephone systems

Details Audio frequency signalling systems for telephone systems Audio frequency signalling systems for telephone systems

H - Electricity

04

M

379/13, 379/18,

H04M 19/04 (2006.01) H04M 1/60 (2006.01) H04M 9/00 (2006.01) H04M 11/02 (2006.01)

Patent

CA 998484

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