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Title: "Bettini" phonograph speaker (patented 1900). [Go to resource]
Description: "Bettini" phonograph speaker (patented 1900). License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1900 Source: Science Museum Creator: Bettini (maker) Identifier: 1932-324 Go to resource More Like this...
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