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[D7801B3], Letter from Edward Phelps Allis to Thomas Alva Edison, May 20th, 1878

Title: [D7801B3], Letter from Edward Phelps Allis to Thomas Alva Edison, May 20th, 1878
Editor's Notes: Inquiry about hearing aid -- followed by several other letters
Author: Allis, Edward Phelps
Recipient: Edison, Thomas Alva
Date: 1878-05-20
Type: Letter
Subject: TAE health; Microphone and other acoustic devices
Folder ID: D7801-F
Microfilm ID: 15:77
Document ID: D7801B3
URL: https://edisondigital.rutgers.edu/document/D7801B3
Rights: Thomas Edison National Historical Park
Publisher: Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
Has Version: Archive.org Viewer, Microfilm Series Reel 15