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Flour-Sifter.
Patent for a centrifugal flour sifter that removes pests, mold, and debris.
Date:
September 13, 1921
Creator:
Brewer, Johnson
System:
The Portal to Texas History
Guide for Drive-Chains.
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.
System:
The Portal to Texas History