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Door Brace

Description: Patent for a door brace. Illustration included.
Date: December 21, 1909
Creator: Friberg, Charles
Partner: UNT Libraries Government Documents Department

Reciprocating Electric Engine

Description: Patent for a reciprocating electric engine. Illustration included.
Date: February 21, 1905
Creator: Wagner, Bruno Otto
Partner: UNT Libraries Government Documents Department

Means for Ventilating and Expelling Water from Mines.

Description: Patent for a ventilation and water pumping system for mines, which pumps out water underground, removes foul air and gases, and keeps the mine supplied with fresh air through pressurizing the air in the mine.
Date: July 21, 1908
Creator: Durack, Patrick H.
Partner: UNT Libraries Government Documents Department

Stamp Mill

Description: Patent for a stamp mill. "The object of the invention is to present a stamp-mill which with a minimum of space utilized for the operating mechanism will give the maximum of output." (line 8-11) illustrations included.
Date: July 21, 1903
Creator: Baker, Richard J.
Partner: UNT Libraries Government Documents Department
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