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| All Patents in class 185/27 | |||||
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| Number | Date | Patentee | Title | Type | |
| 9,020X | Aug. 17, 1835 | H.B. Fernald | Applying the Rising and Falling of Tides to Propel Machinery | tide mills | |
| 568,517 | Sep. 29, 1896 | T.J. Butler | Governor for Motors | machine governors | |
| 734,417 | Jul. 21, 1903 | J.H. Hubbell | Balancing device for revolving bodies | ||