E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
285/29, 166/46.2
E21B 43/01 (2006.01) F16L 15/02 (2006.01) F16L 27/12 (2006.01) F16L 37/00 (2006.01)
Patent
CA 915212
Herd David P.
Morrill Charles D.
LandOfFree
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