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| Patents for James Clark Jr. | |||||
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| Picture | Number | Date | Patentee | Title | |
| 472,063 | Apr. 05, 1892 | J. Clark, Jr., G.S. Maxwell | Automatic railway-switch | ||
 | 701,115 | May 27, 1902 | C.E. Willey | Drilling machinery | |
 | 750,744 | Jan. 26, 1904 | J.F. Willey | Portable drill | |