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| Patents for D. R. Cowl | |||||
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| Number | Date | Patentee | Title | Type | |
| 168,567 | Oct. 11, 1875 | S. Holbrook | Railway Track-Gage | track gauges | |
| 177,702 | May 23, 1876 | R. Ender | Tailor's Measure | special purpose gauges | |