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| All Patents in class 91/463 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,046,447 | Jul. 07, 1936 | E.C. Clarke | Steam hammer | drop hammers | |
| 2,127,324 | Aug. 16, 1938 | E. Cannon | Prefill valve for hydraulic presses | hydraulic metalworking presses | |