Modern telegraph systems and eqipment covering voice frequency,telex,sub-audio and varioplex systems,and all types of modern apparatus including the teleprinter,teletypewriter and creed automatic 5-unit and morse equipment with 126 illus.
Perkins, W.T.
Modern telegraph systems and eqipment covering voice frequency,telex,sub-audio and varioplex systems,and all types of modern apparatus including the teleprinter,teletypewriter and creed automatic 5-unit and morse equipment with 126 illus. - London George 1946
621.382 / P39.5M
Modern telegraph systems and eqipment covering voice frequency,telex,sub-audio and varioplex systems,and all types of modern apparatus including the teleprinter,teletypewriter and creed automatic 5-unit and morse equipment with 126 illus. - London George 1946
621.382 / P39.5M
