Flour-Sifter. (open access)

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. (open access)

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