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| All Patents in class 475/138 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,215,627 | Sep. 24, 1940 | J.M. Walter | Machine tool drive | milling machines | |
| 2,774,250 | Dec. 18, 1956 | K.F. Gallimore | Multi Speed Transmission for Machine Tools | metalworking power transmission | |