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| Patents for John Mackay | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 5,189X | Aug. 14, 1828 | J. Mackay | Fitting hammer heads for piano fortes | |
 | RX-8 | Apr. 18, 1839 | J. Mackay | Improvement in Mode of Fitting the Hammer-Heads of Piano-Fortes | |