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| Patents for F. J. Hartman | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,373,852 | Apr. 05, 1921 | C.J. Allen | Tractor | tractors | |
| 1,879,398 | Sep. 27, 1932 | G.E. Mirfield | Gauge for Sizing Internal Threads | measurement gauges | |