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| All Patents in class 91/1 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 453,247 | Jun. 02, 1891 | S. Smith | Rotary Steam Engine | ||
| 588,655 | Aug. 24, 1897 | J.F. Raders | Non-Centrifugal Governor and Speed Indicator | ||
 | 955,568 | Apr. 19, 1910 | W.D. White | Water-wheel governor | |
 | 1,687,369 | Oct. 09, 1928 | F.J. Lapointe | Hydraulic broaching machine | |
| 3,537,356 | Nov. 03, 1970 | E.I. Odell | Hydraulic Control System | ||
 | 3,538,813 | Nov. 10, 1970 | T.E. Clyce, J.Y. Cromeens | Remote control system | |