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Hydraulic Classifier.
Patent for hydraulic classifier for the treatment of ore. The invention subjects settling solid particles to a secondary classification and prevent the contamination of the settling solids before they are discharged.
Date:
March 21, 1922
Creator:
Allen, Charles
System:
The Portal to Texas History
Metallic Roof.
Patent for a metallic roof in which section edges are secured so that they do not become disconnected, intentional bracing prevents sagging, and securing the roof does not require the use of nails, which prevents leaks.
Date:
February 21, 1922
Creator:
Crawford, Hezekiah H.
System:
The Portal to Texas History