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1971-10-28
Musikinstrument mit Tastenbetaetigung
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1900-01-01
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Decrescendo- und Crescendo-Zug an Pianinos
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Neuerungen an Apparaten zum Wägen, Anzeigen von Kräften oder Prüfen von Materialien
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1923-02-17
Tasteninstrument (Klavier, Fluegel o. dgl.)
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(de )
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