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| All Patents in class 73/470 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,164,900 | Jul. 04, 1939 | J.C. Campbell | Dynamic Balancer for Machine Tools | grinding machines | |
| 2,241,637 | May 13, 1941 | A.H. Dall, H. Ernst | Dynamic Balancing Mechanism for Machine Tools | grinding machines | |