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Hole-Straightener
Patent for a hole straightener for use in drilling oil wells.
Date:
December 3, 1912
Creator:
Decker, Harry R.
System:
The Portal to Texas History
Plumb-Level
Patent for a plumb level that can have its stock changed.
Date:
December 3, 1912
Creator:
Niedergang, Antoine
System:
The Portal to Texas History