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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
Elektrisches Lautsignal mit eingebauter Membran, bei der hinter der Membran ein Solenoid angeordnet ist, unter Verwendung eines beweglichen die Membran in Schwingungen versetzenden Ankers