[N315173], Technical Note, Thomas Alva Edison, April 19th, 1886
https://edisondigital.rutgers.edu/document/N315173
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Title
[N315173], Technical Note, Thomas Alva Edison, April 19th, 1886
Editor's Notes
might actually be dated April 19 as are pages that follow - drawing "Telephone receiver see which strongest end"
Author
Date
1886-04-19
Type
Folder/Volume ID
N315-F
Microfilm ID
42:1033
Document ID
N315173
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University