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FR353917D1905-05-031905-05-03Dispositif pour régler automatiquement la force du son et l'effet des étouffoirs dans les "pianos-orchestrions"
ExpiredFR353917A
(fr)
Dispositif d'amortissement du bruit occasionné par la friction, le choc ou autres, et procédé de fabrication et d'application de la matière employée