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| Patents for O. C. Billman | |||||
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| Number | Date | Patentee | Title | Type | |
| 677,339 | Jul. 02, 1901 | E.M. Comstock | Center Punch and Gage | punches | |
| 955,623 | Apr. 19, 1910 | W.H. Welch | Power Hammer | power hammers | |
| 1,316,961 | Sep. 23, 1919 | D. Lambert | Machine-tool | horizontal boring mills | |