E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
261/66, 166/26.1
E21B 33/14 (2006.01) C04B 14/10 (2006.01) C09K 8/42 (2006.01) E21B 33/13 (2006.01)
Patent
CA 919716
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