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H01H53/00—Relays using the dynamo-electric effect, i.e. relays in which contacts are opened or closed due to relative movement of current-carrying conductor and magnetic field caused by force of interaction between them
Telautograph, bei dem zur UEbertragung jeder der beiden Komponenten der Sendestift-bewegung je zwei verschiedene Frequenzen benutzt werden, und zwar zur Vorwaerts- und Rueckwaertsbewegung in jeder Komponentenrichtung je eine