Telephony and telegraphy
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Telephony and telegraphy
(A.I.E.E.standards, no.34 : June-1922(Reprinted November 1925))
American Institute of Electrical Engineers, c1925
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Telephony and telegraphy
(A.I.E.E.standards, no.34 : June-1922(Reprinted November 1925))
American Institute of Electrical Engineers, c1925