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Plumb-Level

Description: Patent for a plumb level that can have its stock changed.
Date: December 3, 1912
Creator: Niedergang, Antoine
Partner: UNT Libraries Government Documents Department

Hole-Straightener

Description: Patent for a hole straightener for use in drilling oil wells.
Date: December 3, 1912
Creator: Decker, Harry R.
Partner: UNT Libraries Government Documents Department
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