Improvements due to underground cables replacing overhead lines; application of Pupin coils, and of vacuum-tube amplifiers, two-wire and 4-wire conections; inductive interference of high-tension lines and their reduction by means of copper wire.
Long distance telephony
Fernsprechen im Fernverkehr
Elektrische Bahnen ; 1 , n 12
1925
10 pages
14 Figs.
Article (Journal)
German
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