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| All Patents in class 337/344 | |||||
| Picture | Number | Date | Patentee | Title | |
| 2,102,176 | Dec. 14, 1937 | E.J. Dillman | Control Means | ||
| 2,239,146 | Apr. 22, 1941 | J.E. Fleury, E.J. Dillman | Control Device | ||