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| All Patents in class 409/52 | |||||
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| Number | Date | Patentee | Title | Type | |
| 431,139 | Jul. 01, 1890 | W. Curtiss | Machine for dressing the teeth of gear-wheels | gear making machines | |
| 645,427 | Mar. 13, 1900 | E. Polanowski | Machine for Milling Cone Screw Wheels | milling machines | |