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| All Patents in class 427/388.1 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,675,419 | Jul. 03, 1928 | G.T. Pfleger | Process of insulating motor windings | |
 | 2,231,233 | Feb. 11, 1941 | H. Vienhaus | Process of finishing materials | |