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| Patents for R. F. Pray | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,259,569 | Mar. 19, 1918 | H.G. Dittbenner, F.L. Walker | Band-saw mill | band sawmills | |
| 1,260,837 | Mar. 26, 1918 | H.G. Dittbenner, F.L. Walker | Upper saw-guide | bandsaws | |