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| Patents for John M. Benham | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,865X | Aug. 29, 1827 | J.M. Benham | Making aqueducts of water proof lime | ||
| 6,101X | Oct. 01, 1830 | J.M. Benham | Agueducts formed of water-proof lime for conveying water or gas (re-issued) | ||