E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
31/2, 31/23, 31/
E21B 43/26 (2006.01) C09K 3/00 (2006.01) C09K 8/62 (2006.01)
Patent
CA 985891
Boothe Jerry E.
Persinski Leonard J.
LandOfFree
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