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| All Patents in class 409/88 | |||||
| Number | Date | Patentee | Title | Type | |
| 2,100,953 | Nov. 30, 1937 | P.M. Henkes, G. Gorton | Engraving and Related Machines | metal engraving machines | |
| 2,110,873 | Mar. 15, 1938 | P.M. Henkes, G. Gorton | Engraving Machine | metal engraving machines | |