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| All Patents in class 173/140 | |||||
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| Number | Date | Patentee | Title | Type | |
| 880,140 | Feb. 25, 1908 | B. Hastings | Drilling Machine | stone boring and drilling machines | |
| 2,998,333 | Aug. 29, 1961 | E.J. Kielma, A.H. Fotsch | Machine Tool for Removing Material from a Container | milling machines | |