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| All Patents in class 277/392 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,020,052 | Feb. 06, 1962 | R.J. Gits | Shaft Seal | shaft seals | |
| 3,120,959 | Feb. 11, 1964 | R.H. Andresen, H. Jensen | Unitized Face Type Rotary Seal | shaft seals | |
| 3,179,425 | Apr. 20, 1965 | R.H. Andersen | Rotary Seal Employing a Flexible Sleeve | shaft seals | |