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| All Patents in class 409/10 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,092,571 | Apr. 07, 1914 | C.J. Halborg | Machine for Backing Off Hobs or Cutters for Cutting Gears | backing off lathes | |
| 1,753,778 | Apr. 08, 1930 | J.C. Drader | Rack | gear cutting tools | |