Method of sealing the rock around a rock chamber intended...

Details Method of sealing the rock around a rock chamber intended... Method of sealing the rock around a rock chamber intended...

F - Mech Eng,Light,Heat,Weapons

17

C

61/3, 61/2.2

F17C 3/00 (2006.01) B65G 5/00 (2006.01) E21B 33/13 (2006.01) E21F 17/16 (2006.01)

Patent

CA 1004482

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