|
| US4436163 | 22 May 1981 | 13 Mar 1984 | Black & Decker Inc. | Arrangement for converting rotary motion to reciprocatory motion |
| US4446931 | 14 Sep 1981 | 8 May 1984 | Robert Bosch GmbH | Power driven hammer drill |
| US4456076 | 30 Jun 1981 | 26 Jun 1984 | Robert Bosch GmbH | Power-driven hand tool |
| US4487272 | 27 Sep 1982 | 11 Dec 1984 | Robert Bosch GmbH | Impacting drill |
| US4537264 | 19 Mar 1984 | 27 Aug 1985 | Robert Bosch GmbH | Power-driven hand tool |
| US4648609 | 22 Jan 1985 | 10 Mar 1987 | Construction Robotics, Inc. | Driver tool |
| US6283229 | 17 Feb 1998 | 4 Sep 2001 | Earth Tool Company, L.L.C. | Impact device for directional boring |
| US7931095 | 8 Jun 2009 | 26 Apr 2011 | Makita Corporation | Hammer drill |
