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| All Patents in class 409/231 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,632,612 | Dec. 30, 1986 | R.J. Loerch | Spindle Orientation Apparatus | metalworking machine mechanisms | |
| 4,856,153 | Aug. 15, 1989 | N.V. Gusching | Spindle Mechanism | metalworking machine mechanisms | |
| 5,487,631 | Jan. 30, 1996 | R.E. Child | Machine Tools | metalworking machine bearings | |
| 5,971,681 | Oct. 26, 1999 | I.E. Wolfe, R.J. Schroeder | Drawbar guide ring with drive keys | milling machine accessories | |