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| Patents for Chas. I. Welch | |||||
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| Number | Date | Patentee | Title | Type | |
| 787,940 | Apr. 25, 1905 | A.J. Perks | Spirit level attachment for straight edges | ||
| 819,965 | May 08, 1906 | H.S. Williams | Leveling Instrument | levels | |
| 1,342,848 | Jun. 08, 1920 | C.L. Johnson | Cap-Removing Tool | jar wrenches | |