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Flour-Sifter.

Description: Patent for a centrifugal flour sifter that removes pests, mold, and debris.
Date: September 13, 1921
Creator: Brewer, Johnson
Partner: UNT Libraries Government Documents Department

Guide for Drive-Chains.

Description: Patent for a mechanism designed to prevent a guide chain from being displaced from the wheel(s) of its parent machine.
Date: May 17, 1921
Creator: Johnston, Horace G.
Partner: UNT Libraries Government Documents Department
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