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| All Patents in class 210/108 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,206,030 | Sep. 14, 1965 | M.R. Estabrook | Vacuum filter | ||
| 3,305,094 | Feb. 21, 1967 | K.H. Casson | Vacuum filter | ||
| 3,332,553 | Jul. 25, 1967 | K.H. Casson | Vacuum filter | ||