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| All Patents in class 279/52 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,709,600 | May 31, 1955 | J.W. Lehde | Lock and Ejector Collets | tool holding collets | |
| 2,771,297 | Nov. 20, 1956 | W. Nipken | Adjustable stop for a collet or the like | work holding | |