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| Patents for C. J. Hackenberg | |||||
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| Number | Date | Patentee | Title | Type | |
| CA-136,075 | Oct. 10, 1911 | W.L. Bessolo | Wrench | pipe wrenches | |
| 1,012,949 | Dec. 26, 1911 | F. Westendahl | Window Casing Gage | special purpose gauges | |