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| All Patents in class 92/138 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,214,257 | Sep. 10, 1940 | E.M. Pfauser | Hydraulic Power Unit | ||
| 2,635,396 | Apr. 21, 1953 | H.R. Johnson | Portable rubbing machine | handheld power sanders | |