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| All Patents in class 205/217 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,775,671 | Sep. 16, 1930 | T.E. Dunn | Electrolytic Method of Cleaning Metal | ||
| 1,867,527 | Jul. 12, 1932 | T.E. Dunn | Process for Anodic Removal of Surface Metal Film | ||