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Sound-Producing Maching

Description: Patent for "sound producing instruments and sound imitators and comprises an assemble of a plurality of sound producing instruments all unified through a central control for us in connection with theaters and particularly moving pictures."
Date: September 10, 1918
Creator: Illo, Frank
Partner: UNT Libraries Government Documents Department

Interest-Computing Device.

Description: Patent for a mechanical interest computing device, which is designed to be simple to build, maintain, and operate.
Date: December 10, 1918
Creator: Harris, Ira S.
Partner: UNT Libraries Government Documents Department
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