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| All Patents in class 91/206 | |||||
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| Number | Date | Patentee | Title | Type | |
| 182,196 | Sep. 12, 1876 | L. Huntoon | Improvement in compound steam-engines | steam engines | |
| 1,940,142 | Dec. 19, 1933 | R.W. Ott | Milling Machine | milling machines | |
| 2,127,324 | Aug. 16, 1938 | E. Cannon | Prefill valve for hydraulic presses | hydraulic metalworking presses | |