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| All Patents in class 33/501.13 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,318,970 | May 11, 1943 | G.O. Richmond | Apparatus for Testing Gears | measurement gauges | |
| 2,348,712 | May 16, 1944 | C.G. Dahlerup | Gear Testing Machine | gear measuring machines | |