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| All Patents in class 205/440 | |||||
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| Number | Date | Patentee | Title | Type | |
| 339,727 | Apr. 13, 1886 | E.C. Atkins | Art of Manufacturing Soap | ||
| 1,917,022 | Jul. 04, 1933 | T.E. Dunn | Electrochemical Process for Cleaning Metal | ||