Square Piano
Square Pianoforte
Henri Henrion (Saarland, c. 1770)
John Betts (London, c. 1780)
SQUARE PIANOFORTE
John Broadwood and Son, London 1832 [sic] Patent
Muzio Clementi & Co (London, c. 1806)
Astor & Company (London, c. 1810)
Knam (Vienna, c. 1810)
Grand piano
Grand Pianoforte
Johann Frenzel (Linz, Austria, c. 1845)
