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| US4091384 | 17 Ago 1976 | 23 May 1978 | Donald C. Green, Sr. | Monitoring alarm system | | US4838279 | 12 May 1987 | 13 Jun 1989 | | Respiration monitor | | US5663711 | 7 Jun 1995 | 2 Sep 1997 | Aliter Industries | Power failure alarm | | US7508315 | 9 Nov 2005 | 24 Mar 2009 | Caterpillar Inc. | Signaling device and method of alerting a work machine operator to a predetermined condition using same |
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