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| Patents for Martin H. Preis | |||||
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| Number | Date | Patentee | Title | Type | |
| D155,539 | Oct. 11, 1949 | J.A. Hoffman, M.H. Preis | Design for an engraving machine | metal engraving machines | |
| 2,524,636 | Oct. 03, 1950 | M.H. Preis, J.A. Hofmann | Cutter for pantograph engraving machines | metal engraving machines | |