71540034
Nov 4, 1947
Feb 21, 1950
MUD MIXING GUNS AND PARTS FOR THE SAME, SWIVEL JOINTS FOR FLUID CONDUITS AND PARTS FOR THE SAME, COUNTERBALANCE SWIVEL JOINTS FOR FLUID CONDUITS AND PARTS FOR THE SAME, AND WELL MACHINERY-NAMELY, CIRCULATING HEADS AND PARTS FOR THE SAME, WELL CEMENTING APPARATUS AND ROTARY HOSE ADAPTERS
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