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| All Patents in class 92/172 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,510,205 | Sep. 30, 1924 | J.T. Beaty | Cotton tamper | ||
| 2,499,968 | Mar. 07, 1950 | E.M. Pfauser | Pneumatic-Hydraulic Pressure Converter | ||