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| All Patents in class 91/521 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,976,123 | Oct. 09, 1934 | F.S. Haas | Grinding Machinery | ||
| 2,441,339 | May 11, 1948 | S.A. Rivington | Hydraulic system | ||
| 2,791,885 | May 14, 1957 | B. Sassen | Hydraulic Tracer Control | ||