[PT032AAY], Patent Application, Thomas Alva Edison, May 22nd, 1888
https://edisondigital.rutgers.edu/document/PT032AAY
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Title
[PT032AAY], Patent Application, Thomas Alva Edison, May 22nd, 1888
Editor's Notes
Pat. App. 400,646 Objective is to produce a diaphragm for the recorders and reproducers of phonographs, one which will maintain its adjustment and give maximum effect under various condition. Employing a film or membrane of glass or its equivalent porcelain as the diaphragm the difficulties encountered are overcome. [1 fig; 4 claims] Becomes US Pat. 400,646
Author
Date
1888-05-22
Type
Folder/Volume ID
PT032AAY-F
Microfilm ID
114:331
Document ID
PT032AAY
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University