Description of the Herzog automatic return signal for telephone, electric-bells, call-boxes, and other purposes ...

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Main Author
Herzog, Felix Benedict, 1859-1912.
Language(s)
English
Published
[New York, 1883?]
Subjects
Telephone.
Note
"Printed for private use only (not published)."
"By F. Benedict Herzog"--p. [1].
Cover-title.
Physical Description
20 p. ; cm.
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Full view   University of Illinois at Urbana-Champaign