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The working of railway signals and points by electro-magnets, and controlling them, in conjunction with a complete block system, efficiently and economically by a current from a primary or secondary battery
Timmis, Illius A.Volume:
14
Année:
1885
Pages:
1
DOI:
10.1049/jste-3.1885.0003
Fichier:
PDF, 36 KB
1885