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| Patents for Donald O. Lawless | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,961,129 | Jun. 05, 1934 | D.O. Lawless, M. De Haas | Milling Machine | milling machines | |
| 3,106,011 | Oct. 08, 1963 | D.O. Lawless, R.N. Clifton | Milling Cutter | milling machine cutters | |