E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/28
E21B 33/076 (2006.01) E21B 33/06 (2006.01) E21B 33/064 (2006.01)
Patent
CA 926854
Castela Andre
Joubert Philippe
Institut Francais Du Petrole
LandOfFree
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