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| Patents for Northern Trust Co., Executor | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,230,516 | Jan. 18, 1966 | N.T. Co., Executor, L.E. De Neergaard, deceased (Estate of) | Control System for Machine Tools and the Like | machine tool controls | |
| 3,296,606 | Jan. 03, 1967 | N.T. Co., Executor, L.E. De Neergaard, deceased (Estate of) | Control System for Machine Tools Utilizing Magnetic Recording | machine tool controls | |