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Core-Barrel.
Patent for a core barrel for use in rotary drilling of oil or water wells, that will allow for easy extraction of the upwardly extending column of material.
Date:
October 14, 1919
Creator:
Humason, Granville A. & Childs, William L.
System:
The Portal to Texas History
Filter for Oil and Other Lubricants.
Patent for improvements in a filter for oil and other lubricants. Designed for the purpose of cleansing oils, particularly waste oils.
Date:
October 14, 1919
Creator:
Schmidt, George C.
System:
The Portal to Texas History