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Automatic Density-Indicator for Slime-Pulp Separators.
Patent for devices that thickens slimes for ore milling operations in which it will indicate the density and regulate it so it will not go below a predetermined value.
Date:
June 22, 1920
Creator:
Allen, Charles
System:
The Portal to Texas History
Letter-Tying Device
Patent for a package tie. Illustrations included.
Date:
June 22, 1909
Creator:
Greenwood, Bluford Preston
System:
The Portal to Texas History
Filtering-Machine
Patent for a filtering machine which operates centrifugally to filter out solid matter from liquids. Illustrations included.
Date:
June 22, 1909
Creator:
Wilder, Richardson Timothy
System:
The Portal to Texas History