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| All Patents in class 248/663 | |||||
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| Number | Date | Patentee | Title | Type | |
| 751,485 | Feb. 09, 1904 | C.A. Eck | Fan | fans | |
| 2,594,581 | Apr. 29, 1952 | C.H. Phelps | Balance Testing Machine Rotor Mounting | balancing machinery | |