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| Patents for Baldwin Coolidge | |||||
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| Picture | Number | Date | Patentee | Title | |
| 134,381 | Dec. 31, 1872 | W.P. Hopkins | Work Holders for Lathes | ||
| 143,242 | Sep. 30, 1873 | W.P. Hopkins | Gear Cutting Attachments to Lathes | ||