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Rotary Drilling-Machine

Description: Patent for a rotary drilling machine for drilling oil wells. Illustrations included.
Date: February 18, 1913
Creator: Black, Lee J.
Partner: UNT Libraries Government Documents Department

Sectional Dam and Flume

Description: Patent for a sectional dam and flume for small waterways that takes the water to a turbine.
Date: February 4, 1913
Creator: Holmes, Clayton F.
Partner: UNT Libraries Government Documents Department