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[D7801C2A], Letter from John J Simmons to Amos Jay Cummings, June 16th, 1878

Title: [D7801C2A], Letter from John J Simmons to Amos Jay Cummings, June 16th, 1878
Editor's Notes: Wants Edison's circular regarding hearing aid invention
Author: Simmons, John J
Recipient: Cummings, Amos Jay
Mentioned: Edison, Thomas Alva
Date: 1878-06-16
Type: Letter
Subject: Microphone and other acoustic devices
Folder ID: D7801-F
Microfilm ID: 15:128
Document ID: D7801C2A
URL: https://edisondigital.rutgers.edu/document/D7801C2A
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