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| Patents for William C. Hartmann | |||||
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| Number | Date | Patentee | Title | Type | |
| 300,604 | Jun. 17, 1884 | W.C. Hartmann | Die Stock | tap wrenches and die stocks | |
| 657,136 | Sep. 04, 1900 | A.L. Schultz | Combination Tool | surface gauges | |