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| All Patents in class 248/75 | |||||
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| Number | Date | Patentee | Title | Type | |
| 147,402 | Feb. 10, 1874 | S. Ingersoll | Improvement in rock-drills | mining apparatus | |
| 301,387 | Jul. 01, 1884 | H.R. Dickerman, J.S. Oram | Fire Escape | ||