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| All Patents in class 173/199 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,014,229 | Sep. 10, 1935 | A.N. Emmons | Portable slab cutting machine | ||
| 3,028,771 | Apr. 10, 1962 | W.S. Bunnell | Revolving Deep Driller | metal lathe accessories and attachments | |