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| All Patents in class 425/441 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,166,558 | Jan. 04, 1916 | H.C. Little, F.E. Stevenson | Press | hydraulic presses | |
| 2,246,414 | Jun. 17, 1941 | F.W. McIntyre | Plastic molding machine | plastic molding machines | |