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| All Patents in class 277/404 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,278,191 | Oct. 11, 1966 | R.H. Andresen, R.J. Gits | Shaft Seal | shaft seals | |
| 4,434,986 | Mar. 06, 1984 | D.J. Warner | Shaft Seal | shaft seals | |