Description of "detected ramp" apparatus designed by Societe Parisienne-Metrum. Indexed in Engineering Index 1939 p 979, from Genie Civil Dec 17 1938.
Repeating signals in locomotive cab by means of "detected crocodile," Or ramp
Int Ry Congress Assn -- Bul
1939
5 pages
Aufsatz (Zeitschrift)
Englisch
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