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| All Patents in class 324/174 | |||||
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| Number | Date | Patentee | Title | Type | |
| 5,250,896 | Oct. 05, 1993 | J.E. Stanley, R.D. Johnson, R.J. Holmen, D. Mieczkowski | Hand-Held Magnetic Contact Tachometer with Toothed Rotatable Wheel | ||