OPINION BY JUDGE MENCER, June 9, 1975:
National Valve and Manufacturing Co. (National) is a fabricating concern which has three plants located in the vicinity of Pittsburgh. National employs three classifications of production employes who are enumerated as steamfitters, fabricators, and machinists. The fabricators bring the pipe and the fittings to the work benches where the steamfitters fabricate, weld, burn, and fit the pipe and fittings together. When the steamfitters...
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