http://www.movie-camera.it/keystonei.htm
http://www.concord-camera.com/
Company
founded in 1919 in Boston, Massachussets, as Keystone Camera Company
Incorporated by Marks brohters. Before 1919, originally the Marks
brothers manufactured toys for children. In 1965 it was acquired by the
Berkey Photo Inc, Clifton, New Jersey. In 1991 it was acquired by the
Concord Camera Corporation.
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