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| All Patents in class 409/8 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,110,274 | Sep. 08, 1914 | G.W. Sponable | Apparatus for Forming the Ends of Gear Teeth | ||
| 1,138,429 | May 04, 1915 | H.E. Van Ness | Attachment for Milling Machines | ||
| 1,219,481 | Mar. 20, 1917 | G. Leander, L.A. Peterson | Method of Chamfering the Teeth of Gears | ||
| 1,279,278 | Sep. 17, 1918 | M.O. Cross | Gear Toot Rounder | ||
| 2,135,819 | Nov. 08, 1938 | P.T. Klix | Adjustable Chamfering Tool and Holder | ||
| 3,685,393 | Aug. 22, 1972 | R.M. Bell | Device for smoothing irregularities | ||