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| All Patents in class 277/634 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,180,795 | Nov. 21, 1939 | N.A. Christensen | Packing | shaft seals | |
| 4,504,064 | Mar. 12, 1985 | S. Romano | Laser Path Seal | metalworking machine mechanisms | |