Cyclopedia of telephony and telegraphy : a general reference work ... / prepared by a corps of telephone and telegraph experts, and electrical engineers of the highest professional standing ; illustrated with over two thousand engravings ...
|Corporate Author:||American School of Correspondence, Chicago.|
Chicago : The School, 1912.
"Authorities consulted" at beginning of each volume.
4 v. :
fronts. (ports.) ill., plates ;
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