|
| US4152967 | 25 Aug 1977 | 8 May 1979 | | Pneumatic piano action |
| US4491050 | 25 Oct 1983 | 1 Jan 1985 | | Foot-controlled musical instrument |
| US6194643 | 2 Sep 1999 | 27 Feb 2001 | | Key actuation systems for keyboard instruments |
| US6444885 | 21 Dec 2000 | 3 Sep 2002 | | Key actuation systems for keyboard instruments |
| US6781046 | 30 Jan 2001 | 24 Aug 2004 | | Key actuation systems for keyboard instruments |
| US6888052 | 24 May 2002 | 3 May 2005 | | Key actuation systems for keyboard instruments |
| US7439426 | 15 Feb 2006 | 21 Oct 2008 | | Actuation system for keyboard pedal lyre |
