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| US4338847 | 14 Nov 1980 | 13 Jul 1982 | | Electromagnetic devices for actuating piano keys |
| US4383464 | 12 Apr 1982 | 17 May 1983 | | Electromagnetic devices for actuating piano keys |
| 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 |
