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细节
Rowsell's Patent Graphoscope
walnut-veneered body, with a pair of sliding viewing lenses, a 5 inch, 13.5cm., diameter folding magnifier and plaque enscribed ROWSELL'S PATENT GRAPHOSCOPE, and an adjustable stereograph rest
walnut-veneered body, with a pair of sliding viewing lenses, a 5 inch, 13.5cm., diameter folding magnifier and plaque enscribed ROWSELL'S PATENT GRAPHOSCOPE, and an adjustable stereograph rest