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| Patents for L. Dowrille | |||||
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| Number | Date | Patentee | Title | Type | |
| 436,612 | Sep. 16, 1890 | C.H. Newhall | Hammer | nail holding | |
| 686,497 | Nov. 12, 1901 | T. Wiedmann | Telescopic Micrometer Gage | inside micrometers | |