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All Patents in class 205/440 | |||||
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Picture | Number | Date | Patentee | Title | |
![]() | 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 |