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| Patents for L. W. Langdon | |||||
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| Number | Date | Patentee | Title | Type | |
| 45,054 | Nov. 15, 1864 | L.W. Langdon | Improvement in screw-cutting machines | screw machines | |
| 45,055 | Nov. 15, 1864 | L.W. Langdon | Improvement in miter-boxes | miter boxes | |