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All Patents in class D18/57 | |||||
Number | Date | Patentee | Title | Type | |
D155,539 | Oct. 11, 1949 | M.H. Preis, J.A. Hoffman | Design for an engraving machine | metal engraving machines | |
2,688,275 | Sep. 07, 1954 | L.C. Hammond, D.E. Sutton | Printing plate shaving machine |