[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

Date

1888-05-22

Decade

1880-1889

Folder/Volume ID

PT032AAY-F

Microfilm ID

114:331

Document ID

PT032AAY

Publisher

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