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| Patents for L. Caldwell | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,355 | Nov. 24, 1843 | W. Foster | Soapstone Oiler for Bench Plane | plane oilers | |
| 4,085 | Jun. 20, 1845 | J.B. Coffin | Boring-machine | drilling and boring | |