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Shaft and Pulley Collar.

Description: Patent for a collar for pulleys and shafts with set-screws that protects the set-screws from damage or harming people working with the systems.
Date: May 14, 1907
Creator: Beal, Ephaphras Lee
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