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| All Patents in class 409/180 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,604,679 | Oct. 26, 1926 | R.L. Carter | Gauge for shaping machines | handheld routers | |
| 4,428,158 | Jan. 31, 1984 | J.J. Fatula, Sr. | Method and apparatus for grinding irregular surfaces | grinders | |