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| All Patents in class 74/52 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,397,546 | Nov. 22, 1921 | A. Rebelski, M. Torre | Oval chuck | |
| 2,051,052 | Aug. 18, 1936 | E.K. Morgan | Machine Tool Hydraulic Control System | ||
 | 2,216,828 | Oct. 08, 1940 | E.J. Paque | Power driven hack saw | |