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| All Patents in class 280/421 | |||||
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| Number | Date | Patentee | Title | Type | |
| 883,934 | Apr. 07, 1908 | F.I. Cass | Traction Engine | steam traction engines | |
| 2,668,557 | Feb. 09, 1954 | W.G. Hoelscher | Conduit System for Machine Tools | metal lathe mechanisms | |