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| All Patents in class 175/173 | |||||
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| Number | Date | Patentee | Title | Type | |
| 53,896 | Apr. 10, 1866 | R. Stewart | Annular Auger | auger bits | |
| 2,998,333 | Aug. 29, 1961 | E.J. Kielma, A.H. Fotsch | Machine Tool for Removing Material from a Container | milling machines | |
| 3,104,989 | Sep. 24, 1963 | H.W. Kippers, R.K. Sedgwick | Machine Tool for Removing a Mass of Material from a Container and Method | milling machines | |