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| All Patents in class 409/187 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,615,372 | Oct. 28, 1952 | E.E. Coffin | Milling Machine Spindle Axial Shift Control | machine tool controls | |
| 3,329,066 | Jul. 04, 1967 | D.B. Wood, III | Spindle Torque Amplifier | metalworking machine mechanisms | |
| 3,521,526 | Jul. 21, 1970 | E.A. Olig, S.E. Klabunde | Method and Apparatus for Positional Control Compensation for Temperature Changes in Machine Tool Spindles | metalworking machine mechanisms | |