E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
117/237, 166/35
E21B 36/00 (2006.01) C09K 8/84 (2006.01) E21B 33/10 (2006.01)
Patent
CA 936468
Ayers Robert C.
Bayless Jack H.
Walter L. Penberthy Jr.
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