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Publication of DE317546CpublicationCriticalpatent/DE317546C/de
Resonanzfedermotor fuer Mittelfrequenzsteueranlagen, bei dem zur Ausfuehrung eines Arbeits-vorganges nur ein einziger Steuerfrequenzstrom notwendig ist und das unmittelbar von einer Resonanzfeder bewegte Triebrad mehrere Umdrehungen ausfuehren muss