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細節
Achromatic Stereoscope no. 258
R. & J. Beck, London; polished-wood body, lacquered-brass lens panel with a pair of focusing lenses and hinged top, inverting into box; contained within a matching cabinet --13½ in (34cm.) high
R. & J. Beck, London; polished-wood body, lacquered-brass lens panel with a pair of focusing lenses and hinged top, inverting into box; contained within a matching cabinet --13½ in (34cm.) high