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| All Patents in class 82/90 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,002,938 | May 28, 1935 | L.A. Dumser, O.W. Floody | Machine tool | ||
| 2,138,522 | Nov. 29, 1938 | W.F. Groene, W.R. Meyer | Four-spindle drum type crankshaft lathe | crankshaft lathes | |