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| Patents for Holger Nielsen | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,542,826 | Jun. 23, 1925 | H. Nielsen | Chuck | drill press chucks | |
| 1,542,827 | Jun. 23, 1925 | H. Nielsen | Lathe center | lathe centers | |
| 1,606,972 | Nov. 16, 1926 | H. Nielsen | Chuck | drill press chucks | |