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| All Patents in class 74/574.3 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,343,421 | Mar. 07, 1944 | F.P. Porter | Torsional Vibration Damper | vibration dampers | |
| 2,507,558 | May 16, 1950 | W. Schroeder, A.H. Dall | Dynamic Balancing Mechanism | metalworking machine mechanisms | |