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| All Patents in class 84/238 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,754X | May 15, 1827 | T. Loud, Jr. | Horizontal piano fortes | music instrument maker | |
| 6,507X | Apr. 22, 1831 | E.R. Currier | Horizontal piano forte | music instrument maker | |