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| Patents for William A. Chapman | |||||
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| Number | Date | Patentee | Title | Type | |
| 130,725 | Aug. 20, 1872 | W.P. Lathrop | Improvement in lathes for turning irregular forms | pattern lathes | |
| 328,486 | Oct. 20, 1885 | E.P. Hayes | Trip-saw | circular crosscut saws | |