Public address system using wireless mobile communication...

Details Public address system using wireless mobile communication... Public address system using wireless mobile communication...

H - Electricity

04

R

H04R 27/00 (2006.01) H04W 4/00 (2009.01) H04W 12/08 (2009.01) H04W 84/18 (2009.01)

Patent

CA 2690661

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