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5097934 | Quinlan, Jr. | Mar 1992 | A |
5123873 | Rasmussen | Jun 1992 | A |
5647469 | Yamagishi et al. | Jul 1997 | A |
5980089 | Weis | Nov 1999 | A |
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6179704 | Suzuki | Jan 2001 | B1 |
Entry |
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Pepperl+Fuchs Group, http://www.pepperl-fuchs.com.* |
Schan Electric Corp., http://www.schanelecsz.com/m12m18.html. |