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| US4045630 | 8 sept. 1975 | 30 août 1977 | The United States of America as represented by the Secretary of the Department of Health, Education and Welfare | Chin activated switch | | US5568127 | 27 oct. 1995 | 22 oct. 1996 | Richard M. Bang | Drowsiness warning device and neck support | | US5939989 | 12 mai 1998 | 17 août 1999 | Richard M. Bang | Electronic switch utilized in, for example, a drowsiness warning device |
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