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| All Patents in class 91/168 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,499,235 | Feb. 28, 1950 | L.D. Tyson | Hydraulic System for Plural Motor Operation | metalworking machine mechanisms | |
| 3,139,005 | Jun. 30, 1964 | W.I. Evans | Velocity Error Compensating Device | metalworking machine mechanisms | |