E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
153/15, 166/65
E21B 33/127 (2006.01) F16K 7/02 (2006.01) F16L 27/04 (2006.01) F16L 27/12 (2006.01) F16L 33/16 (2006.01) F42D 1/08 (2006.01)
Patent
CA 905846
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