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| US5278371 | 28 oct. 1992 | 11 janv. 1994 | Brother Kogyo Kabushiki Kaisha | Keyswitch assembly with support mechanism coupled to support plate beneath printed circuit board |
| US5278372 | 28 oct. 1992 | 11 janv. 1994 | Brother Kogyo Kabushiki Kaisha | Keyboard having connecting parts with downward open recesses |
| US5278374 | 28 oct. 1992 | 11 janv. 1994 | Brother Kogyo Kabushiki Kaisha | Assembly with an asymmetrical resilient spring |
| US5280147 | 28 oct. 1992 | 18 janv. 1994 | Brother Kogyo Kabushiki Kaisha | Keyswitch assembly with a key support limiting transverse, longitudinal and rotational movement of the key |
| US5667061 | 1 juil. 1996 | 16 sept. 1997 | Packard Hughes Interconnect Company | Linear cam-assisted plunger switch |