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| All Patents in class 134/32 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,011,107 | Aug. 13, 1935 | E.W. Lape, Jr. | Method of cleaning articles | ||
| 2,095,502 | Oct. 12, 1937 | H.L. Johnston | Cleaning and sterilizing method and apparatus | ||