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| All Patents in class 285/349 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,298,119 | Oct. 06, 1942 | S.C. Gebert | Connector Device | solid fuel stokers | |
| 2,752,801 | Jul. 03, 1956 | E.T. Olson | Fluid actuated clamp | work holding | |