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These are 1925 to 1930s eye glasses used by an Optometrist to prepare patients prescription. There are a variety of adjustment controls. Lenses would be placed on front, adjustments made for best eyesight. Two, 2, exam lenses are shown and and included. Device is stamped American Optical Company with Patent numbers 1,550,582 - 1925 and 1,794,571 - 1930. Instrument is in good condition.
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