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| All Patents in class 175/162 | |||||
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| Number | Date | Patentee | Title | Type | |
| 5,932X | Apr. 23, 1830 | I. Overall | Boring rocks | trade specific | |
| 2,349,033 | May 16, 1944 | N.R. Elliott | Boring Head | pipe and orifice cleaners | |