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| All Patents in class 84/380R | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,968 | Dec. 25, 1849 | C.G. Christman | Flute | musical instruments | |
| 76,389 | Apr. 07, 1868 | T. Berteling | Improvement in flutes | musical instruments | |
| 1,376,986 | May 03, 1921 | B.F. Winterhoff | Socket for wind instruments | music instrument maker | |
| 2,775,915 | Jan. 01, 1957 | D.C. De Ford | Key mechanism for musical instruments | musical instruments | |