Sequential tone signalling system for centrally dispatched...

Details Sequential tone signalling system for centrally dispatched... Sequential tone signalling system for centrally dispatched...

H - Electricity

04

Q

325/19, 340/74,

H04Q 7/12 (2006.01) G08G 1/123 (2006.01) H04B 1/00 (2006.01) H04L 1/00 (2006.01) H04Q 1/45 (2006.01)

Patent

CA 991291

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