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| All Patents in class 251/113 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,618,459 | Nov. 18, 1952 | F.P. Forss | Portable rotary grinder or die filer | handheld power tools | |
| 2,671,294 | Mar. 09, 1954 | E.S. Cornell | Hydraulically Driven Machine Tool | surface grinders | |