E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/31
E21B 43/24 (2006.01) C09K 8/58 (2006.01) E21B 43/16 (2006.01) E21B 43/18 (2006.01) E21B 43/22 (2006.01)
Patent
CA 1022843
Allen Joseph C.
Brown Alfred
Woodward Charles D.
Wu Ching H.
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