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| 1857 | North America - USA 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, | Alexander Beckers of New York City patents a stereo-viewer with a revolving mechanism which allows multiple views of different types to be inspected sequentially by turning a knob. |