Viewmaster: the Victorian Stereoscope Reborn

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First introduced at the 1939 New York World's Fair by Sawyer's Inc. of Portland, Oregon, the Viewmaster was the last widely popular iteration of the stereoscope, and quickly became one of the 20th Century's most recognizable toys. In addition to the classic viewers and reels, Sawyer's also produced a line of home projectors as well as cameras and other equipment for making one's own Viewmaster reels at home.

SOURCES:
https://www.vmresource.com/manuals/index.html
https://www.mentalfloss.com/article/84549/chakka-chhh-hidden-history-view-master
https://www.ohs.org/blog/ohs-view-master-collection.cfm
https://phsc.ca/View-Master.html
https://3dstereo.com/collections/history-1
https://ca.fabtintoys.com/view-master/
https://news.google.com/newspapers?id=alBIAAAAIBAJ&sjid=Z_0DAAAAIBAJ&pg=3154%2C7249326
https://www.stereoscopy.com/tru-vue/truvuestory.html

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