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| Patents for Milton Bowker | |||||
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| Number | Date | Patentee | Title | Type | |
| 49,073 | Aug. 01, 1865 | M. Bowker | Improved Conical Turning Gage | special purpose gauges | |
| 50,442 | Oct. 17, 1865 | M. Bowker | Center-Punch | center punches | |