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Patents for John Mackay
Patents 1 - 2 of 2
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NumberDatePatenteeTitleType
5,189XAug. 14, 1828J. MackayFitting hammer heads for piano fortesmusic instrument maker
RX-8Apr. 18, 1839J. MackayImprovement in Mode of Fitting the Hammer-Heads of Piano-Fortesmusic instrument maker
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