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| All Patents in class 226/51 | |||||
| Number | Date | Patentee | Title | Type | |
| 2,766,984 | Oct. 16, 1956 | W.H. Franzemann | Method of making manifold forms | ||
| 2,947,928 | Aug. 02, 1960 | C.H. Killian | Automatic Machinist | machine tool controls | |