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| All Patents in class 392/407 | |||||
| Picture | Number | Date | Patentee | Title | |
![]() | 2,446,712 | Aug. 10, 1948 | H.A. McIlvaine | Lamp device | |
| 3,739,150 | Jun. 12, 1973 | R.J. Rahn | Granite Surface Plate With Controlled Heat | ||