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| All Patents in class 137/242 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,604,776 | Oct. 26, 1926 | F. Hardinge | Valve | industrial furnaces | |
| 2,090,232 | Aug. 17, 1937 | F. Ritz | Injection Nozzle | diesel engines | |