1886 [Supplied year] Edison Phonoplex System -- Circulars and Brochures
(Tate, Alfred Ord; Insull, Samuel) Sales and service; Phonoplex and railroad telegraphy
[CA012]  Primary Printed Series -- Other Companies: Edison Phonoplex System (ca. 1886)
[CA012A; TAEM 96:499]
Courtesy of Thomas Edison National Historical Park.