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| All Patents in class 346/28 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,152,804 | Sep. 07, 1915 | G.W. Freeland | Recording mechanism | locomotive coal feeding apparatus | |
| 2,691,415 | Oct. 12, 1954 | S. Standal | Measuring bullet velocity | ||