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| All Patents in class 315/283 | |||||
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| Number | Date | Patentee | Title | Type | |
| 664,995 | Jan. 01, 1901 | G. Ernst | Screw Thread Gage | thread gages | |
| 2,424,505 | Jul. 22, 1947 | B.P. Rupersburg | Method of and apparatus for operating hot cathode lamps | ||