U.S. federal trademark · Serial No. 72371541 · Reg. No. 0929927
TELEPHONE EQUIPMENT-NAMELY, SINGLE FREQUENCY INBAND SIGNALING SYSTEMS, ECHO SUPPRESSORS, TELEPHONE TERMINAL DEVICES, DC SIGNALING EQUIPMENT, VOICE TERMINATING EQUIPMENT, RINGING GENERATORS, SWITCHING EQUIPMENT, LINE AND SPECIAL PURPOSE AMPLIFIERS, AND INTER-TERMINAL TRANSMISSION SYSTEMS
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