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| All Patents in class 84/254 | |||||
| Number | Date | Patentee | Title | Type | |
| 5,189X | Aug. 14, 1828 | J. Mackay | Fitting hammer heads for piano fortes | music instrument maker | |
| RX-8 | Apr. 18, 1839 | J. Mackay | Improvement in Mode of Fitting the Hammer-Heads of Piano-Fortes | music instrument maker | |