Transmission of power by double wire for working signals on Belgian State Rys.; semophores of new method of signaling.
Mechanical manipulation of the three position semaphore arms on the Belgian state railways
Int. Ry. Congress -- Bul
International Railway Congress Association -- Bulletin ; 5 , n 7 ; p 619-695
1923
77 pages
83 Figs.
Aufsatz (Zeitschrift)
Englisch
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