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| All Patents in class 91/437 | |||||
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| Number | Date | Patentee | Title | Type | |
| 138,420 | Apr. 29, 1873 | O. Marland | Marine Steam-Engine Governors | steam engine governors | |
| 2,091,425 | Aug. 31, 1937 | W.H. Wood | Hydraulically operated machine tool | surface grinders | |