Timing device for accumulating a telephone long distance...

Details Timing device for accumulating a telephone long distance... Timing device for accumulating a telephone long distance...

H - Electricity

04

M

58/2, 379/40

H04M 15/30 (2006.01) G04B 47/06 (2006.01) G04C 23/06 (2006.01) G04F 7/08 (2006.01) G07C 1/00 (2006.01)

Patent

CA 1023153

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