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| Patents for Mens A. Dahl | |||||
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| Picture | Number | Date | Patentee | Title | |
| 457,077 | Aug. 04, 1891 | M.A. Dahl | Attachment for Graduated Rules | ||
| 1,051,564 | Jan. 28, 1913 | M.A. Dahl | Engraver's Ruling Machine Tool Holder | ||