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| All Patents in class 91/523 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,222,998 | Dec. 14, 1965 | J.F. Verhoeven | Two Dimensional Hydraulic Tracing System | profiling machines | |
| 3,238,622 | Mar. 08, 1966 | E.P. Bullard, III | Program Control | ||