Counties
1 Matching Results
Results open in a new window/tab.
Results:
1 - 1 of
1
Method of Sampling.
Patent for improving methods of boring wells by "raising the cuttings from an earth boring drill to the surface" (lines 70-71), including illustrations.
Date:
July 20, 1920
Creator:
Carmichael, Robert E.
System:
The Portal to Texas History