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| Patents for George E. Campbell | |||||
| Picture | Number | Date | Patentee | Title | |
![]() | 1,486,632 | Mar. 11, 1924 | G.E. Campbell | Tilt shaft for band mills | |
![]() | 1,567,911 | Dec. 29, 1925 | G.E. Campbell | Tension for band mills | |