Flat copper disc used voice recording, known as "M

Made:
1930
maker:
Sherard Osborn Cowper-Coles

Flat copper disc used voice recording, known as "Minivoice", made by Cowper Coles in 1930.

Details

Category:
Metallurgy
Object Number:
2002-213
type:
copper disc
credit:
Mr. Peter Cowper-Coles.
status:
Permanent collection

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