Release of war time developments of micro-frequency radio, using multi-channel time pulse modulation, disrupts previous conceptions of use of line wires as well as carrier on wires, while Western Union adds to confusion by announcing adoption of new radio systems, thereby abandoning ownership of pole lines on railroad.
Railroad telegraph and telephone saw big change in 1945
Ry Age
Railway Age ; 120 , n 1
1946
5 pages
Article (Journal)
English
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