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| All Patents in class 91/415 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,987,186 | Jan. 08, 1935 | R.E. Flanders | Hydraulic Transmission | hydraulic apparatus | |
| 2,502,547 | Apr. 04, 1950 | C.E. Adams | Hydraulic apparatus | ||
| 2,505,223 | Apr. 25, 1950 | F.R. Whitcomb | Glazing and polishing machine | polishing and buffing machinery | |