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| Patents for Andreas C. Nielsen | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,226,574 | May 15, 1917 | A.C. Nielsen | Micrometer Gage | micrometers | |
| 2,171,802 | Sep. 05, 1939 | A.C. Nielsen | Tool Holder | lathe tool holders and tool posts | |