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| All Patents in class 318/490 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 286,274 | Oct. 09, 1883 | P.B. Delany | Electrical Synchronous Movement | ||
| 286,275 | Oct. 09, 1883 | P.B. Delany | Electrical Synchronous Movement | ||
| 3,048,832 | Aug. 07, 1962 | A.O. Fitzner | Position Indicating Means for Machine Tools | ||
| 3,896,363 | Jul. 22, 1975 | R.N. Magee, R.C. Kinsel | Feedback Circuit for Detecting the Failure of a Stepping Motor to Respond to the Control Circuit | ||