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Primary Printed Series -- Other Companies: Edison Phonoplex System (1890)
[CA038]
"Edison Phonoplex System of Telegraphy." 1890. 29 pp.
"Operator's Guide" n.d. 16 pp.
"Edison Phonoplex System of Telegraphy." 1892 [38 pp.], 1899 [40 pp.] [not selected].
Courtesy of Thomas Edison National Historical Park.