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| All Patents in class 91/311 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,998,003 | Apr. 16, 1935 | L.F. Nenninger, C.W. Goodrich, H. Ernst | Hydraulic Feed Control | hydraulic apparatus | |
| 2,574,751 | Nov. 13, 1951 | V.R. Noll | Engine for producing reciprocatory motion having substantially constant velocity except during reversals | debarking machines | |