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Title: Watson close-up lens, 2", f/1.9, for Marconi Mk.III camera [Go to resource]
Description: Watson close-up lens, 2", f/1.9, for Marconi Mk.III camera License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1987-124 Go to resource More Like this...
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