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(de )
Selbsteinkassirender Kraftmesser
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1988-12-01
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(de )
Repetitionsmechanik für Pianinos
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(de )
1921-04-08
Tastenmaschine mit Kraftantrieb
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(de )
1923-09-20
Typenhebelantrieb
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(de )
Neuerung an Pianino-Mechaniken
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(de )
1941-03-25
Addiermaschine.
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