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Telephone practice in mines and on railways
Illustrated description of a system for transmitting instructions from the surface to underground works. (3500 w.) (No. 14444 A)
Telephone practice in mines and on railways
Illustrated description of a system for transmitting instructions from the surface to underground works. (3500 w.) (No. 14444 A)
Telephone practice in mines and on railways
Elec Engr, Lond
1910
Article (Journal)
English
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