AMERICAN TELEPHONE AND TELEGRAPH (AT&T) - Lot of 2 - Copyright 1923 Reprints
AT&T Application of Electricity & Magnetism to Transmission In The Transmission in
the Telephone Plant - Sections III & V
Section III Specific Applications - Telephone Repeaters - Revised 1927, Reprinted 1930 - 64 pages
Section V Specific Applications - Transmission Measurements - Revised 1928 - 33 pages
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L5/24