2 Matching Results
Results open in a new window/tab. Unexpected Results? Search the Catalog Instead.
Results:
1 - 2 of
2
Drill-Bit
Patent for Drill-Bit that is especially designed for purpose of drilling through rock, or other hard formations and is also adapted for use in drilling through softer formation, such as shell.
Date:
June 10, 1919
Creator:
Culmore, March J. A.
System:
The Portal to Texas History
Process of and Apparatus for Treating Oil
Patent for a process of and an apparatus for treating oil in a more efficient manner.
Date:
January 7, 1919
Creator:
Seibert, Frank M. & Brady, John D.
System:
The Portal to Texas History