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| Patents for Albert W. Erdman | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,536,736 | May 05, 1925 | A.W. Erdman, P.F. Vokal | Process of Making Milling Cutters | ||
| 1,586,186 | May 25, 1926 | A.W. Erdman | Milling Hob | ||