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Hydraulic Swivel.

Description: Patent for a hydraulic swivel used with wells including instructions and illustrations.
Date: May 16, 1911
Creator: Layne, Mahlon E.; Hall, Samuel N. & Layne, Charles F.
Partner: UNT Libraries Government Documents Department

Hydraulic Drill

Description: Patent for a hydraulic drill that allows drill bits to be easily inserted and removed and locks them in place when inside the drill.
Date: May 21, 1907
Creator: Charlton, James
Partner: UNT Libraries Government Documents Department