LOT 204 Stereo Testing Viewer Ortho-Rater, c. 1950
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Bausch & Lomb, Rochester. Height-adjustable device for measuring depth of vision and visual acuity as well as color blindness, with 220-volt electric operation, rotating drum holding 8 stereo slides of 6 x 16 cm and a second drum holding 5 double-slides, working. 品相: (3/3)
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