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| All Patents in class 198/661 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,073,059 | Mar. 09, 1937 | B.M. Guthrie | Mechanical Stoker | solid fuel stokers | |
| 2,225,215 | Dec. 17, 1940 | B.M. Guthrie | Stoker | solid fuel stokers | |