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| All Patents in class 73/161 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,850,742 | Mar. 22, 1932 | J.G. Collins | Spring testing device | ||
| 3,253,463 | May 31, 1966 | K.R. Larson | Checking and Testing Devices for Coil Springs and the Like | ||