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| All Patents in class 285/347 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,298,119 | Oct. 06, 1942 | S.C. Gebert | Connector Device | solid fuel stokers | |
| 3,039,489 | Jun. 19, 1962 | L.A. Botkin | Valve structure | ||