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| All Patents in class 277/398 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,185,554 | Jan. 02, 1940 | J.T. Janette | Seal for shafts | shaft seals | |
| 2,325,296 | Jul. 27, 1943 | W.G. Baldenhofer | Lubricant Seal for Shafts | metalworking machine lubrication | |
| 3,239,232 | Mar. 08, 1966 | R.H. Andresen | Self-leveling Rotary Seal | shaft seals | |
| 3,972,536 | Aug. 03, 1976 | E.C. Wahl, D.J. Warner | Rotating Shaft Seal Assembly | shaft seals | |