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Graphoscope
Magnifier integrated in a portable case used in the past to view photographs and postcards.
Nice model with a large diameter biconvex lens and a folding frame inside that can be moved in two directions: up and down and front and back, to allow the focal length to be adapted to the user's view.
Nice model with a large diameter biconvex lens and a folding frame inside that can be moved in two directions: up and down and front and back, to allow the focal length to be adapted to the user's view.
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