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LL/12480
n.d.
Alexander Beckers of New York City patented a stereo-viewer on April 7, 1857. It had a revolving mechanism which allowed multiple views of different types to be inspected sequentially by turning a knob.

Stereo viewer
Archives of Modern Conflict OR National Gallery of Canada
This stereo-viewer held 25 images but there was another version that held 50.
 
LL/12480


 

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