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| US4066850 | 4 Jun 1976 | 3 Jan 1978 | NCR Corporation | Keyboard switch assembly having interchangeable cover plate, indicating layer and actuator switch assembly in any operative combination |
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| US4994988 | 7 Mar 1988 | 19 Feb 1991 | Brother Kogyo Kabushiki Kaisha | Printer having a multi-mode control panel selectively manipulatable between varying modes of operation |
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| US5075686 | 23 Jan 1990 | 24 Dec 1991 | Canon Kabushiki Kaisha | Switch input device |
| US5144303 | 19 Sep 1990 | 1 Sep 1992 | | Stacked computer keyboard function key multiple template retainers |
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