E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 44/00 (2006.01) E21B 4/16 (2006.01)
Patent
CA 2107099
2107099 9216718 PCTABS00016 A method for regulating the penetration of a drilling equipment, where a tool (1) in the drill head comprises two or more individually drilling bits. With one or more bits in backed position in their holding devices, the penetration or the pushing force for the penetration of the whole tool body (1) or the drilling unit is restricted.
Ilomaki Valto
Bereskin & Parr
Ilomaki Valto
LandOfFree
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