U.S. federal trademark · Serial No. 75610945 · Reg. No. 635112
Electronic conference communication systems, comprising on/off switches, and controls for volume, balance, and adjustment for treble/bass; receivers and transmitters; voting units, namely congress delegate and/or chairman unit for parliamentary, multiple choice or audience response voting; parts and accessories therefor, namely, microphones, headphones, loudspeakers, power supplies, plugs, sockets and cables
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