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| Patents for William H. Gelbaugh | |||||
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| Number | Date | Patentee | Title | Type | |
| 750,842 | Feb. 02, 1904 | W.H. Gelbaugh | Hinge Gage | butt gauges | |
| 940,001 | Nov. 16, 1909 | W.H. Gelbaugh | Hinging Gage | butt gauges | |
| 1,031,995 | Jul. 09, 1912 | W.H. Gelbaugh | Metal Butt Gage | butt gauges | |