DEVICE FOR CHECKING CHARGE OF COST OF PHONE TALKS BY STATION COSTING SYSTEM EQUIPMENT Russian patent published in 1994 - IPC

FIELD: telephony. SUBSTANCE: device has control unit, permanent memory unit, on-line memory unit, information output unit, manifold, input unit, which has control signal former, signal converter, n 2AND-not gates. Device also has unit for integrating with costing system equipment, unit for mating with line, commutator which has two feed resistors, digit identifier, two indicating relays, four contact members. EFFECT: improved truth of checking; simplified equipment; widened functions of equipment. 1 dwg