E - Fixed Constructions – 21 – C
Patent
E - Fixed Constructions
21
C
37/9
E21C 35/193 (2006.01) B25D 17/02 (2006.01) E21B 17/043 (2006.01) E21C 35/18 (2006.01)
Patent
CA 1023142
Bailey Edward A.
Hibbard George A.
Pertusio Rene
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