E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
254/47
E21B 19/22 (2006.01) A47F 13/06 (2006.01) B65G 37/00 (2006.01)
Patent
CA 979880
Grolet Pierre
Thiery Jean
Institut Francais Du Petrole
LandOfFree
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