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| All Patents in class 318/480 | |||||
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| Number | Date | Patentee | Title | Type | |
| 280,426 | Jul. 03, 1883 | W. Wheeler | Focus Regulator for Electric Arc Lamps | electric arc lamps | |
| 1,891,777 | Dec. 20, 1932 | A.G. Plimmer | Grinding Machine | grinding machines | |
| 2,710,934 | Jun. 14, 1955 | J.A. Senn | Motor Controlled Machine Tool Positioning Mechanism | milling machines | |