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| Patents for John G. Leffingwell | |||||
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| Picture | Number | Date | Patentee | Title | |
| 334,247 | Jan. 12, 1886 | J.G. Leffingwell | Mitering-machines | ||
 | 415,045 | Nov. 12, 1889 | J.G. Leffingwell | Cutting-machine | |