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| All Patents in class 307/156 | |||||
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| Number | Date | Patentee | Title | Type | |
| 892,656 | Jul. 07, 1908 | G.W. Euker | Controller for alternating-current motors | ||
| 3,196,320 | Jul. 20, 1965 | J.F. Manting | Magnetic lift device | ||