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| Patents for Err S. McGonegal | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,756,949 | May 06, 1930 | E.S. McGonegal | Portable Grinding Tool | metal lathe accessories and attachments | |
| 2,055,302 | Sep. 22, 1936 | E.S. McGonegal | Portable grinding tool | metal lathe accessories and attachments | |