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MathushekWormsLabel. Mathuschek nameboard label Worms Hermann RuthSommer Abb Inschrift des Teetischklaviers Hammerklavier in Form eines Teetisches von Ferd Mathuschek Worms Heyer Nr Alte Musikinstrumente Ein Leitfaden fr Sammler Bibliothek fr Kunst und Antiquittensammer Band Richard Carl Schmidt Co Berlin uncredited not signed