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American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 598
.. CO. ii—V .- • I I - £\ _4 ^ »>ip^ llllllll MB Rh. A s\Telegraph
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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