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MULTIPLE-CIRCUIT ELECTRONIC SIGNALLING EQUIPMENT IN PARTICULAR FOR MONITORING OPERATION OF FACILITIES UTILIZING GAS AS ENERGY SOURCE AND MORE PARTICULARY FOR MONITORING OPERATION OF GAS FIRED TUNNEL AND CHAMBER FURNACES
MULTIPLE-CIRCUIT ELECTRONIC SIGNALLING EQUIPMENT IN PARTICULAR FOR MONITORING OPERATION OF FACILITIES UTILIZING GAS AS ENERGY SOURCE AND MORE PARTICULARY FOR MONITORING OPERATION OF GAS FIRED TUNNEL AND CHAMBER FURNACES