E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/21
E21B 43/26 (2006.01) E21B 43/24 (2006.01) E21B 43/247 (2006.01)
Patent
CA 1032074
Antonova Roza I.
Fedorov Nikolai A.
Gershevich Elfrida G.
Kreinin Efim V.
Volk Alfei F.
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