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| All Patents in class 340/679 | |||||
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| Number | Date | Patentee | Title | Type | |
| 890,697 | Jun. 16, 1908 | J.E. Noeggerath | Protective device for unipolar machines | electric motors | |
| 1,040,378 | Oct. 08, 1912 | W.L. Miller | Electric Signaling System | machine tool controls | |
| 2,350,174 | May 30, 1944 | H.N. Stephan, H.M. Lucas | Boring Machine | horizontal boring mills | |
| 2,902,904 | Sep. 08, 1959 | R.L. Henry, J.A. Rave, Jr. | Control System for Machine Tools | machine tool controls | |