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| Patents for Edward R. Markham | |||||
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| Number | Date | Patentee | Title | Type | |
| 413,950 | Oct. 29, 1889 | E.R. Markham | Lathe Tool | lathe tools | |
| 437,308 | Sep. 30, 1890 | E.R. Markham | Surface Gage | surface gauges | |