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| All Patents in class 277/504 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,068,536 | Jan. 19, 1937 | D.P. Davies | Pump | centrifugal pumps | |
| 3,669,459 | Jun. 13, 1972 | M.M. Bass | Oscillating spindle seal | ||