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Tunneling-Machine.

Description: Patent for a tunneling machine that has the ability to easily change course and utilizes a conical shaped shell to receive loose earth and convey it towards the mouth of the tunnel. The invention also has a rotating head connected to the carrying vehicle meaning that the machine is supported and driven forward against the tunnel as it is cut away.
Date: December 30, 1919
Creator: Dana, Frank L.
Partner: UNT Libraries Government Documents Department

Pump.

Description: Patent for an improved pump valve designed for a pump for pumping oil from oil wells "which will not be affected by the fluid or gas pressure in the bore" (lines 17-18).
Date: September 30, 1919
Creator: Graf, Sydney H.
Partner: UNT Libraries Government Documents Department

Pump

Description: Patent for a new form of pump developed by Granville A. Humason. This pump is an improvement of prior models, intended to be "adaptable for many different uses, but which will be simple and durable in structure" (lines 14-18).
Date: December 30, 1919
Creator: Humason, Granville A.
Partner: UNT Libraries Government Documents Department

Self-Cleaning Pump-Valve

Description: Patent for a pump valve used in pumping oil wells which cleans itself with sand. The valve is simple and cheaply manufactured.
Date: September 30, 1919
Creator: Graf, Sydney H.
Partner: UNT Libraries Government Documents Department

Rotary Boring-Drill.

Description: Patent for "new and useful Improvements in Rotary Boring-Drills...of the collapsible type." (lines 5-12) including instructions and illustrations.
Date: December 30, 1919
Creator: Humason, Granville A.
Partner: UNT Libraries Government Documents Department

Combination Drill Bit and Drill Shank

Description: Patent for "Improvements in Combination Drill-Bits and Drill-Shanks" (lines 6-7) including illustrations.
Date: December 30, 1919
Creator: Humason, Granville A.
Partner: UNT Libraries Government Documents Department
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