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| All Patents in class 248/320 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,198,078 | Aug. 03, 1965 | W.D. Zettler, G.H. Schurger | Machine Tool Control Center | machine tool controls | |
| 3,469,814 | Sep. 30, 1969 | R.W. Peterson, A.W. Carlson | Mirror suspension | ||