E21B 1/14

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
8727034 Rotary power tool operable in first speed mode and a second speed modeFeb 19, 08May 20, 14ROBERT BOSCH GMBH
8579042 Battery pack and cordless tool using the sameFeb 19, 13Nov 12, 13HITACHI KOKI CO., LTD.
8381829 Battery pack and cordless tool using the sameFeb 28, 07Feb 26, 13HITACHI KOKI CO., LTD.
8322463 Down hole multiple piston tools operated by pulse generation tools and methods for drillingJan 30, 08Dec 04, 12Lewal Drilling Ltd.
7201235 Driver drillNov 09, 04Apr 10, 07MAKITA CORPORATION
6394189 Zero gravity robotic system and method for using sameJan 06, 00May 28, 02GENESIS SYSTEMS GROUP, LLC