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| Patents for Joseph D. Leach | |||||
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| Number | Date | Patentee | Title | Type | |
| 57,522 | Aug. 28, 1866 | J.D. Leach | Improvement in machines for holding the heads of casks | barrel making machines | |
| 171,927 | Jan. 11, 1876 | J.D. Leach, C. Farnham | Improvement in Beam Squares | squares | |