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Title: Derogy lens with two extra lenses, and three stops in case; [Go to resource]
Description: Derogy lens with two extra lenses, and three stops in case; engraved: "Brevet d'Invention" . S.G.d.G. Derogy opten. Quai de l'horloge 33 Paris. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Creator: Derogy (maker) Identifier: 1907-85 Go to resource More Like this...
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