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| Patents for Hans E. Grabau | |||||
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| Number | Date | Patentee | Title | Type | |
| 777,626 | Dec. 13, 1904 | H.E. Grabau | Machine for Beating Leaf Metal | power hammers | |
| 814,003 | Feb. 27, 1906 | H.E. Grabau | Hammer for Beating Leaf Metal | power hammers | |