72369210
Aug 27, 1970
Aug 1, 1972
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
Fancy Goods