U.S. federal trademark · Serial No. 72369210 · Reg. No. 0939808
ELECTRONIC TESTING DEVICES-NAMELY, TESTING AND INDICATING CIRCUITS FOR DISPLAYING VISUALLY THE EXISTENCE AND DIRECTION OF ELECTRICAL CURRENT FLOW IN MAGNETIC RECORDING CIRCUITS BY SELECTIVELY ENERGIZING ONE OF A PAIR OF LIGHTS FOR EACH RECORDING CIRCUIT, SAID CIRCUIT ESPECIALLY FOR USE IN BILLING TAPE RECORDERS
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