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[D7801B1], Letter from Horace J Smith to Thomas Alva Edison, May 19th, 1878

Title: [D7801B1], Letter from Horace J Smith to Thomas Alva Edison, May 19th, 1878
Editor's Notes: Inquires about hearing aid
Author: Smith, Horace J
Recipient: Edison, Thomas Alva
Date: 1878-05-19
Type: Letter
Subject: Microphone and other acoustic devices
Folder ID: D7801-F
Microfilm ID: 15:71
Document ID: D7801B1
URL: https://edisondigital.rutgers.edu/document/D7801B1
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