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| All Patents in class 392/407 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,446,712 | Aug. 10, 1948 | H.A. McIlvaine | Lamp device | electrical devices | |
| 3,739,150 | Jun. 12, 1973 | R.J. Rahn | Granite Surface Plate With Controlled Heat | surface plates | |