Selector-type telephone lines for railroads and street railroads; system employed on lines of narrow-gage railroad in Switzerland, allows for communication with any receiver on line with aid of only two wires without returning ground; wiring diagrams; details of equipment.
Selector-type telephone lines for railroads and street railroads
Lignes telephoniques selectives pour chemins de fer et tramways electriques
Traction Electrique ; 4 , n 1
1933
6 pages
Aufsatz (Zeitschrift)
Französisch
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Telephone selector systems in use on railroads
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