Hearing Aid
date: label: date made
content: 1927
name: label: maker
content: Dictograph Products Company
label: maker
content: Dictograph Products Company
notes: label: Description
content: The Acousticon Model 30 is a carbon microphone hearing aid with a bone conduction head piece with band attached, amplifier, and battery connection. This example was made by the Dictograph Products Company, Inc. in 1927, and donated to the Smithsonian in 1939.
label: Description
content: Ref: Kelley M. Turner and Norton W. Johnston, “Carbon-Ball Transmitter,” U.S. Patent 844,635 (Feb. 19, 1907), assigned to General Acoustic Co.
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Medicine
creditLine: label: Credit Line
content: Dictograph Products Company, Inc.
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MG.M-04754
label: catalog number
content: M-04754
label: accession number
content: 151789
objectType: label: Object Name
content: hearing aids
label: Other Terms
content: Medicine
physicalDescription: label: Measurements
content: overall: 4 1/2 in x 5 in x 1 in; 11.43 cm x 12.7 cm x 2.54 cm