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| All Patents in class 235/143 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,172,793 | Feb. 22, 1916 | O.D. Hapgood | Revolution Counter | measurement gauges | |
| 2,129,979 | Sep. 13, 1938 | A. Kaufmann, G.L. Storm, C. Westervelt | Measuring Device | measurement gauges | |