Improvements in Automatic Advertising Devices
Description:
Patent for an automatic advertising device that can show various signs or display cards and provides "an endless belt of transparent material which is differently colored" (lines 12-15) so that the sign may be "artistically changed" (lines 17-18). Includes instructions and illustrations.
Date:
March 5, 1912
Creator:
Murphey, William A.
Item Type:
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Patent
Partner:
UNT Libraries Government Documents Department