Brief description of the system used. (2d part) (3000 w.) (No. 30892 G)
Railway telephony in the United States of America
Bul Int Ry Cong
1912
Aufsatz (Zeitschrift)
Englisch
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Engineering Index Backfile | 1908
|Radio telephony on railway trains
Engineering Index Backfile | 1924
|Online Contents | 1994
Online Contents | 1994
Online Contents | 1996