Sign: J.M. Schweighofer’s und Söhne in Wien,
k.k.Hof-Piano-Forte Fabrikanten
7 octave audio range, Viennese mechanics, upper frame dimmers, 2 pedals. Its fatigue, straight line, resonant fiber direction is perpendicular to the strings. 3 iron stiffeners. Swinging bass and bass guards helped spring
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