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Title: Dictograph 11-way office intercom unit with talk back and li [Go to resource]
Description: Dictograph 11-way office intercom unit with talk back and listening facilities, desk type License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1970-259 Go to resource More Like this...-
Dictograph loudspeaking "master" house-telephone…Dictograph loudspeaking "master" house-telephone unit
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