Hole-Straightener (open access)

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 (open access)

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