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COCK DEVICE FREELY ADJUSTABLE TO CHANGE IN GAS FLOW IN COMBINATION OF MAIN TAP COCK INCORPORATING OVERFLOWRATE PREVENTING ALVE AND RELIEF VALVE MECHANISM* HORIZONTAL FEED PIPE SOCKET* VERTICAL FEED PI
COCK DEVICE FREELY ADJUSTABLE TO CHANGE IN GAS FLOW IN COMBINATION OF MAIN TAP COCK INCORPORATING OVERFLOWRATE PREVENTING ALVE AND RELIEF VALVE MECHANISM* HORIZONTAL FEED PIPE SOCKET* VERTICAL FEED PI