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| All Patents in class 409/234 | |||||
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| Number | Date | Patentee | Title | Type | |
| 5,110,240 | May 05, 1992 | L.O. Kern, J.G. Zeilinger | Apparatus for Coupling Tool Holders | metalworking machine tool holders | |
| 5,492,441 | Feb. 20, 1996 | H. Schürfeld | Clamping Device for Connecting Machine Spindles With Tool Holders | tool changers and storage mechanisms | |
| 5,971,681 | Oct. 26, 1999 | I.E. Wolfe, R.J. Schroeder | Drawbar guide ring with drive keys | milling machine accessories | |