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| All Patents in class 425/556 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,163,658 | Jun. 27, 1939 | E.S. Bird | Casting machine for stereotype plates | die casting machines | |
| 2,246,414 | Jun. 17, 1941 | F.W. McIntyre | Plastic molding machine | plastic molding machines | |
| 2,306,316 | Dec. 22, 1942 | L.F. Marsh | Die structure for injection molding machines | plastic molding machines | |