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| All Patents in class 242/571.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,096,949 | Jul. 09, 1963 | H.W. Huffman | Air expandable core shaft | ||
| 3,133,740 | May 19, 1964 | A.W. Drantz | Hydraulic Type Holder for Drill Chucks and the Like | hydraulic apparatus | |