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| Patents for Pratt & Whitney | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,252,928 | Jan. 08, 1918 | F. Müller | Lathe | metal lathes | |
| 1,535,267 | Apr. 28, 1925 | J.J. Thacher | Spindle-stop mechanism | ||