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| Patents for Frederick Ritz | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,090,232 | Aug. 17, 1937 | F. Ritz | Injection Nozzle | diesel engines | |
| 2,131,970 | Oct. 04, 1938 | F. Ritz | Piston Ring Construction | piston rings | |
| 2,136,466 | Nov. 15, 1938 | F. Ritz | Fuel Supply System | fuel pumps | |