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| All Patents in class 29/DIG.067 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,017,882 | Feb. 20, 1912 | A.B. Landis | Cutter-head | metal threading machines | |
| 1,017,883 | Feb. 20, 1912 | A.B. Landis | Cutter-head | metal threading machines | |
| 1,758,973 | May 20, 1930 | C. Rasmussen | Pipe-threading machine | pipe threading machines | |
| 2,470,350 | May 17, 1949 | J.A. Harrington | Water-cooled grinding wheel | surface grinders | |