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| All Patents in class 173/191 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 7,972 | Mar. 11, 1851 | J.W. Fowle | Steam drilling-machine | |
| 4,433,871 | Feb. 28, 1984 | R. Bertrand | Machine for Cutting Curbstones, Sidewalls and the like | ||