System used by one of largest English companies and which is said to be independent of "earth" connections and therefore not to any considerable extent affected by "earth" faults.
A system of railway traffic control by telephone
Post Office Elec. Engrs. Jl
Post Office Electrical Engineers Journal ; 12 , n 2
1919
11 pages
7 Figs.
Article (Journal)
English
© Metadata Copyright Elsevier B. V. All rights reserved.
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