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| All Patents in class 451/161 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,561,936 | Jul. 24, 1951 | E.L. McFerren | Way Grinding Machine | surface grinders | |
| 4,534,684 | Aug. 13, 1985 | B.H. Johnson | Apparatus For Milling A Gear For A Double Enveloping Worm Gear Drive | ||