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| All Patents in class 91/30 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,036,206 | Apr. 07, 1936 | H. Ernst | Machine Tool | ||
| 2,167,758 | Aug. 01, 1939 | W.M. Fairbairn, A.M. Johnson | Method and machine for honing cylindrical surfaces | ||
| 2,949,893 | Aug. 23, 1960 | H.C. McCurdy | Tracer Mechanism | ||
| 3,000,362 | Sep. 19, 1961 | R.L. McCurdy, administratix, H.C. McCurdy, deceased (estate of) | Tracer Mechanism | ||
| 3,016,804 | Jan. 16, 1962 | J.G. Osburn, F. Zankl | Program Control System | ||