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| All Patents in class 73/37.6 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,993,830 | Mar. 12, 1935 | R.E. Conover | Grinding Machine | grinding machines | |
| 2,259,472 | Oct. 21, 1941 | C. Johnson | Duplicator for machine tools | milling machine accessories | |
| 2,585,533 | Feb. 12, 1952 | W.J. Bryant, T.H. Ljunggren, W.F. Moore | Internal grinding machine with automatic air gauge sizing | cylindrical grinders | |
| 2,626,464 | Jan. 27, 1953 | M. Mennesson | Micrometer | micrometers | |
| 3,210,987 | Oct. 12, 1965 | E.C. Bruns | Pneumatic Measuring Circuit | pneumatic gauges | |