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Crane Hook Blocks; Wire Rope Sheaves; Rigging Blocks; Logging Blocks; Mining Blocks; Oilfield Tubing Blocks; Oilfield Wellhead Assemblies-Namely, Independent Screwed Type Casing Heads, Independent Screwed Type Tubing Heads, Flanged Casing Heads, and Flanged Tubing Heads; and Oilfield Couplings-Namely, Casing Threaded Couplings and Tubing Threaded Couplings