[NS7802G], Technical Note, John Kruesi, Thomas Alva Edison, June 22nd, 1878

Item

Abstract

auriphone for the deaf (helmholz resonater ear trumpets) -- magnaphone

Date

1878-06-22

Decade

1870-1879

Identifier

NS7802G

Folder Set

NS7802

Title

[NS7802G], Technical Note, John Kruesi, Thomas Alva Edison, June 22nd, 1878

Microfilm ID

7:762

Publisher

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