71541421
Nov 17, 1947
Feb 21, 1950
OIL WELL TOOLS-NAMELY, REVERSING TOOLS, RELEASING SPEARS, TAPERS, BOX TAPS, INSIDE CUTTERS, OUTSIDE CUTTERS, RELEASING OVERSHOTS, IMPRESSION BLOCKS, TUBING [ TOOL JOINTS, ROPE SPEARS, WALL HOOK GUIDES ] , ROTARY SHOES, AND WASH PIPES
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