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| All Patents in class 277/391 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,447,930 | Aug. 24, 1948 | J.L. Biggs | High-speed Oil Seal | shaft seals | |
| 2,712,459 | Jul. 05, 1955 | E.C. Wahl | High Speed Shaft Seal | shaft seals | |
| 3,276,780 | Oct. 04, 1966 | R.H. Andresen, C.F. Glut | Vibration Control for Bellows Seal | shaft seals | |
| 3,288,474 | Nov. 29, 1966 | R.J. Gits | Bellows Seal Structure | shaft seals | |
| 3,445,119 | May 20, 1969 | L.K. Hanson, R.H. Andresen | Self-Compensating Seal | shaft seals | |