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| All Patents in class 209/39 | |||||
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| Number | Date | Patentee | Title | Type | |
| 790,417 | May 23, 1905 | D.L. Adelsperger | Pneumatic Separator | separators | |
| 2,221,918 | Nov. 19, 1940 | E.A. Hall, K.R. Bohn | Valve Grinding Machine | valve grinding tools | |