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| All Patents in class 192/58.91 | |||||
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| Number | Date | Patentee | Title | Type | |
| 541,483 | Jun. 25, 1895 | J. Hartness | Fluid Controlled Clutch and Speed Regulator | metalworking variable speed mechanisms | |
| 3,133,617 | May 19, 1964 | P. Hartmann | Hydraulic variable speed drive | bench vises | |