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| All Patents in class 33/501.7 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,014,668 | Sep. 17, 1935 | A. Rinderknecht | Means for Examining Gear Wheels | measurement gauges | |
| 2,802,393 | Aug. 13, 1957 | A.D. Young | Inspection Method and Apparatus | comparators | |
| 3,276,135 | Oct. 04, 1966 | W.B. McCardell | Gear Tooth Checking System | gear measuring machines | |