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| All Patents in class 277/380 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,325,296 | Jul. 27, 1943 | W.G. Baldenhofer | Lubricant Seal for Shafts | metalworking machine lubrication | |
| 3,389,921 | Jun. 25, 1968 | B.V. Lojkutz | Seal Adapted for a Link Belt Assembly | shaft seals | |