Hänvisningar finns i följande patent|
| US5785126 | 23 apr 1996 | 28 jul 1998 | Svenska Skum AB | Method of extinguishing of fire in open or closed spaces and means for performing the method | | US8164293 | 8 sep 2009 | 24 apr 2012 | Hoffman Enclosures, Inc. | Method of controlling a motor | | US8183810 | 8 sep 2009 | 22 maj 2012 | Hoffman Enclosures, Inc. | Method of operating a motor |
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