Keystone View Company - End of The Company

End of The Company

As a subsidiary of Mast Development Company, Keystone produced telebinoculars, eye training products and overhead projectors. In 1972 Gifford Mast closed down the Meadville manufacturing site, although the name of Keystone View Company continues to be used on eye training equipment.

In 1978, the company's records and inventory of negatives, weighing more than 30 tons, were donated to the UCR/California Museum of Photography at the University of California Riverside, where they are now known as the Keystone-Mast collection.

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