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| All Patents in class 474/76 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,909,522 | May 16, 1933 | J.G. Collins | Lathe | ||
| 2,346,028 | Apr. 04, 1944 | L.B. Huthsing, C.M. Gregory | Variable speed belt drive | drill presses | |