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| All Patents in class 409/16 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,330,167 | Sep. 21, 1943 | W.F. Zimmermann | Thermally Insulated Hobbing Machine | gear hobbing machines | |
| 2,330,168 | Sep. 21, 1943 | W.F. Zimmermann | Hobbing Machine | gear hobbing machines | |