E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
26/155, 166/26.1
E21B 17/00 (2006.01) E21B 17/08 (2006.01) F16L 9/18 (2006.01)
Patent
CA 1035275
Richardson Bart D.
Waggoner Michael L.
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