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| Patents for George L. colburn | |||||
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| Number | Date | Patentee | Title | Type | |
| 477,737 | Jun. 28, 1892 | L.H. Colburn | Slotting Machine | key seating machines | |
| 1,143,570 | Jun. 15, 1915 | F. Burgess | Gear hobber | gear making machines | |