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| Patents for F. L. Campbell | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 411,681 | Sep. 24, 1889 | W.H. Ridgway | Crane | |
 | 415,561 | Nov. 19, 1889 | W.H. Ridgway | Water-wheel | |
 | 453,449 | Jun. 02, 1891 | W.H. Ridgway | Jet or impact water-wheel | |