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Interest-Computing Device.
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.
System:
The Portal to Texas History
Sound-Producing Maching
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
System:
The Portal to Texas History