U.S. federal trademark · Serial No. 72447547 · Reg. No. 1010688
MULTI-FREQUENCY TONE TEST SETS
ELECTRICAL DEVICES FOR USE IN OR WITH TELEPHONE AND SIMILAR COMMUNICATIONS SYSTEMS-NAMELY, MULTI-FREQUENCY TONE ADAPTION AND CONVERSION APPARATUS FOR ADDING MULTI-FREQUENCY TONE CAPABILITY TO ROTARY DIAL TELEPHONE SYSTEMS OR PARTS THEREOF, MULTI-FREQUENCY TONE RECEIVERS, MULTI-FREQUENCY TONE GENERATORS, KEY SYSTEM TONE INTERCOMS, MULTI-FREQUENCY TONE AMPLIFIERS, VOICE OPERATED SWITCHES, AND SERVICE OBSERVING SYSTEM
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