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| Patents for Niles Tool Works | |||||
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| Number | Date | Patentee | Title | Type | |
| 723,840 | Mar. 31, 1903 | A.L. De Leeuw | Controlling Switch System | machine tool controls | |
| 764,115 | Jul. 05, 1904 | A.L. De Leeuw | Speed Changer | metalworking speed changing mechanisms | |