73111206
Dec 30, 1976
Jun 27, 1978
W-K-M WELLHEAD SYSTEMS INC.
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WELLHEADS AND PARTS THEREOF, INCLUDING CASING HEADS, CASING HEAD SPOOLS, SLIP ASSEMBLIES, TUBING HANGERS, TUBING HEADS, TUBING HEAD ADAPTERS, DRILLING CONTROL MANIFOLDS, AND CHRISTMAS TREE ASSEMBLIES