DE188557A
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DE3785680T2
(de )
1993-11-11
Rückziehgerät für ein Kleinklavier und Mittel zu seiner Anwendung.
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DE101353C
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DE422022C
(de )
1925-05-15
Klaviermechanik
DE213564C
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DE18590C
(de )
Neuerungen an Klavieren mit Klanggabeln
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DE116684C
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DE27596C
(de )
Neuerung an Musikinstrumenten
AT20149B
(de )
1905-05-25
Phonetische Schreibmaschine.
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