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| All Patents in class 191/23R | |||||
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| Number | Date | Patentee | Title | Type | |
| 554,719 | Feb. 18, 1896 | W. Oesterlein | Conduit electric railway | electric railroads | |
| 2,716,675 | Aug. 30, 1955 | W.G. Hoelscher | Electrical Feed Rail Structure for Lathes | metal lathe mechanisms | |