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| All Patents in class 125/11.19 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,120,198 | Jun. 07, 1938 | R.G. Anderson, J.Y. Blazek | Valve grinder | vehicle mechanic | |
| 2,144,095 | Jan. 17, 1939 | K. Zwick | Cutter grinding machine | tool grinders | |
| 2,209,071 | Jul. 23, 1940 | E.J. Bullard | Grinding and Lapping Machine | lapping machines | |