The PVC cable compounds are normally manufactured by processing the compositions of polyvinylchloride that are produced as granules. The process involves application of stabilizers, modifiers and plasticizers. 475 more words
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Post indication valves were developed and patented by innovators Crookham and Lee in 1972 for Clow Corp., a pipeline manufacturing company, and were publicly installed for the first time in 1974. 715 more words