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| US6215388 | 27 Sep 1996 | 10 Apr 2001 | Therm-Q-Disc, Incorporated | Parallel connected PTC elements |
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| US6759940 | 10 Jan 2002 | 6 Jul 2004 | Lamina Ceramics, Inc. | Temperature compensating device with integral sheet thermistors |
| US6862164 | 7 May 2002 | 1 Mar 2005 | Tyco Electronics Raychem K.K. | Circuit protection arrangement |
