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| All Patents in class 205/300 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,872,709 | Aug. 23, 1932 | H. Ernst | Gasket | hydraulic apparatus | |
| 1,898,765 | Feb. 21, 1933 | T.E. Dunn | Electrocleaning Process | ||