U.S. federal trademark · Serial No. 72377667 · Reg. No. 0931681
MODULATING AND DEMODULATING EQUIPMENT FOR MODULATING AND DEMODULATING A CARRIER FREQUENCY WAVE FORM SO THAT IN A COMPLETE TELEPHONE CIRCUIT ONE SUBSCRIBER MAY TRANSMIT AND RECEIVE SIGNALS AT ONE FREQUENCY LEVEL AND ANOTHER SUBSCRIBER MAY SEND AND RECEIVE SIGNALS AT A DIFFERENT FREQUENCY LEVEL
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