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| All Patents in class 73/862.27 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 248,612 | Oct. 25, 1881 | H. Ruddick | Recording Dynamometer | |
 | 592,442 | Oct. 26, 1897 | J.W. von Pittler | Dynamometer | |
| 813,324 | Feb. 20, 1906 | W.H. Ruddick, Administrator, H. Ruddick, deceased (Estate of) | Dynamometer | ||