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| All Patents in class 91/428 | |||||
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| Number | Date | Patentee | Title | Type | |
| 453,980 | Jun. 09, 1891 | E.S. Matthews | Hydraulic valve-gear | ||
| 2,027,706 | Jan. 14, 1936 | L.L. Schauer, J.H. McKewen | Counterbalance valve | drill presses | |