E21B 1/04

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
9938769 Ram boring deviceJul 29, 15Apr 10, 18Tracto-Technik GmbH & Co. KG
7159671 Power tool with reverse gearing operated by external maneuver ringMar 03, 04Jan 09, 07ATLAS COPCO TOOLS AB
6467554 Quick reverse mechanism for pneumatic boring toolAug 20, 01Oct 22, 02The Charles Machine Works, Inc.
5505270 Reversible pneumatic ground piercing toolOct 19, 94Apr 09, 96EARTH TOOL COMPANY, LLC
4660655 Pile-driving apparatus and method of operating such apparatusDec 28, 84Apr 28, 87Not available