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| Patents for J. A. Leonard | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 74,062 | Feb. 04, 1868 | J.W. Emerson | Improvement in machines for boring wagon-hubs | |
 | 197,644 | Nov. 27, 1877 | F.D. Livermore | Improvement in heating-stoves | |