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| Patents for Charles F. Hultgren | |||||
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| Number | Date | Patentee | Title | Type | |
| 733,648 | Jul. 14, 1903 | C.F. Hultgren | Chain Tongs | chain and strap wrenches | |
| 826,939 | Jul. 24, 1906 | C.F. Hultgren | Chain Wrench | chain and strap wrenches | |