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| All Patents in class 451/900 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,392,819 | Jan. 15, 1946 | I.J. Gruenberg, S.G. Brady | Gear Grinding Machine | gear grinding machines | |
| 2,456,060 | Dec. 14, 1948 | C.G. Pardee, J.H. Hoern | Rotor Grinder | cylindrical grinders | |