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| US4332303 | 4 Ago 1980 | 1 Jun 1982 | Zahnradfabrik Friedrichshafen, AG | Auxiliary power steering |
| US4649951 | 2 Jul 1985 | 17 Mar 1987 | | Assisted slide for pressure compensation in a hydraulic distributor |
| US4793363 | 11 Sep 1986 | 27 Dic 1988 | Sherwood Medical Company | Biopsy needle |
| US5212950 | 6 May 1992 | 25 May 1993 | Kabushiki Kaisha Komatsu Seisakusho | Hydraulic circuit with pilot pressure controlled bypass |
