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| All Patents in class 474/23 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,096,339 | Oct. 19, 1937 | P.B. Reeves | Variable speed spinning frame drive | spinner | |
| 2,295,161 | Sep. 08, 1942 | H.C. Clay | Hydraulic Control Mechanism | hydraulic machinery | |