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(de )
1978-08-03
Klaviermechanik
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(de )
1979-11-29
Elektrische schreibmaschine
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Transponirvorrichtung für Pianinos
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(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html )
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Neuerungen an Indicatoren
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Thürschlofs mit Signalapparat. I
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(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html )
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(de )
1910-12-10
Mechanik für selbsttätige Musikwerke.