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| All Patents in class 91/181 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 128,062 | Jun. 18, 1872 | C.W. Patten | Improvment in Rotary Steam-Engines | ||
| 403,714 | May 21, 1889 | R.T. Abell | Steam Engine | ||
| 414,045 | Oct. 29, 1889 | E. Huber | Steam Engine | ||
 | 2,620,631 | Dec. 09, 1952 | J.A. Denton | Control mechanism for lumber edger press rollers | |
| 2,791,885 | May 14, 1957 | B. Sassen | Hydraulic Tracer Control | ||