U.S. federal trademark · Serial No. 73093302 · Reg. No. 1068897
NINETEEN-STATION INTERCOM UNIT PROVIDING SELECTIVE SIGNALING AND INTERCOMMUNICATING CAPABILITY BETWEEN STATIONS ON CONVENTIONAL PUSHBUTTON TELEPHONE KEY SYSTEMS, THE UNIT PROVIDING INDEPENDENT TALKING CURRENT AND DUALTONE MULTI-FREQUENCY SELECTIVE SIGNALING IN SUCH SYSTEMS
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