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| All Patents in class 408/42 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,253,413 | Aug. 19, 1941 | H.R. Young | Spindle Drive Control for Machine Tools | machine tool controls | |
| 2,330,167 | Sep. 21, 1943 | W.F. Zimmermann | Thermally Insulated Hobbing Machine | gear hobbing machines | |
| 2,808,745 | Oct. 08, 1957 | R.E. Blomquist, W.S. Swanson | Chamfering machine | ||