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| Patents for H. C. Underwood | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,430,624 | Oct. 03, 1922 | G.A. Carlson | Polishing machine | ||
| 1,430,625 | Oct. 03, 1922 | G.A. Carlson | Work-holding device | ||
| 1,477,426 | Dec. 11, 1923 | G.A. Carlson | Polishing machine | ||