E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/8
E21B 7/20 (2006.01) E21B 43/10 (2006.01)
Patent
CA 1031762
Lokshin Efim L.
Starinsky Anatoly A.
Volk Alfei F.
LandOfFree
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