DK17042C -
Procedure for Changing the Attenuation in Wires according to the Pupine System with the Period Number of the Oscillations to Be Transmitted.
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Procedure for Changing the Attenuation in Wires according to the Pupine System with the Period Number of the Oscillations to Be Transmitted.
DK17042D
Procedure for Changing the Attenuation in Wires according to the Pupine System with the Period Number of the Oscillations to Be Transmitted.
DK17042C
(en)
Connection device for automatic Telephone systems, where connections of various Significance are to be provided, e.g. domestic and out-of-town connections.