E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
31/16, 166/31, 4
E21B 43/22 (2006.01) C09K 8/584 (2006.01) E21B 43/20 (2006.01)
Patent
CA 1023541
Flournoy Kenoth H.
Shupe Russell D.
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