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| All Patents in class 73/507 | |||||
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| Number | Date | Patentee | Title | Type | |
| 138,420 | Apr. 29, 1873 | O. Marland | Marine Steam-Engine Governors | steam engine governors | |
| 1,900,050 | Mar. 07, 1933 | W. Ernst | Hydraulic Press Platen Travel Equalizer | hydraulic presses | |
| 2,412,957 | Dec. 24, 1946 | F.A. Barnes | Machine tool control | milling machine accessories | |