Drill head and sealing apparatus therefor

Details Drill head and sealing apparatus therefor Drill head and sealing apparatus therefor

F - Mech Eng,Light,Heat,Weapons

16

J

255/23

F16J 15/18 (2006.01) E21B 33/00 (2006.01) E21B 33/08 (2006.01) F16J 15/16 (2006.01)

Patent

CA 971552

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