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| All Patents in class 337/313 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,926,706 | Sep. 12, 1933 | E.J. Dillman, L.W. Eggleston | Control Device | industrial control apparatus | |
| 2,088,163 | Jul. 27, 1937 | E.J. Dillman | Control Device | motor controls | |