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| All Patents in class 209/218 | |||||
| Number | Date | Patentee | Title | Type | |
| 2,221,918 | Nov. 19, 1940 | E.A. Hall, K.R. Bohn | Valve Grinding Machine | valve grinding tools | |
| 2,642,994 | Jun. 23, 1953 | K.H. Casson | Apparatus for handling magnetic material | ||