[NS7802K], Technical Note, Thomas Alva Edison, Charles Batchelor, July 2nd, 1878

Item

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Abstract

megaphone (telephonoscope)

Date

1878-07-02

Decade

1870-1879

Identifier

NS7802K

Folder Set

NS7802

Title

[NS7802K], Technical Note, Thomas Alva Edison, Charles Batchelor, July 2nd, 1878

Microfilm ID

7:768

Publisher

Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University

Timestamp

July 2, 1878