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استاندارد
MSS SP-118-2002:Compact Steel Globe & Check Valves Flanged, Flangeless, Threaded & Welding Ends
Chemical and Petroleum Refinery Service
Manufacturers Standardization Society of the Valve and Fittings Industry, Inc
MSS SP-118-2002:Compact Steel Globe & Check Valves Flanged, Flangeless, Threaded & Welding Ends