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| All Patents in class 384/441 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,198,919 | Sep. 19, 1916 | H.L. Holt | Rotary Tool Holder | tool holders | |
| 2,080,683 | May 18, 1937 | L. Yost | Pump Construction | centrifugal pumps | |