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| All Patents in class 409/75 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 643,991 | Feb. 20, 1900 | G.B. Taylor | Machine for Cutting Spiral End Helical Teeth in Chuck Jaws | ||
 | 1,588,003 | Jun. 08, 1926 | B.H. Blood | Thread-hobbing machine | |