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| Patents for Adolph L. De Leeuw | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,147,615 | Jul. 20, 1915 | A.L. De Leeuw | Over Arm | milling machines | |
| 1,165,369 | Dec. 21, 1915 | A.L. De Leeuw | High Power Pulley Drive | metalworking power transmission | |
| 1,166,974 | Jan. 04, 1916 | A.L. De Leeuw | Machine Tool Control | machine tool controls | |