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| All Patents in class 409/211 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,956,482 | Oct. 18, 1960 | P.F. Olton | Automatic Variable Counterbalance | metalworking machine mechanisms | |
| 3,013,473 | Dec. 19, 1961 | S.C. Straus | Swivel Head for Milling Machines | milling machines | |
| 5,388,935 | Feb. 14, 1995 | P.C. Sheldon | Six Axis Machine Tool | milling machines | |
| 5,556,242 | Sep. 17, 1996 | E.E. Kirkham, P.C. Sheldon | Space Frame for a Machine Tool | workpiece changers and storage mechanisms | |