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Landing Device for Aeroplanes.

Description: Patent for improvements in landing devices for aeroplanes that can be controlled by the aviator and adjusted with the direction of the plane's movement as it lands.
Date: September 7, 1920
Creator: Martin, Ernest L.
Partner: UNT Libraries Government Documents Department

Water-Heating Attachment for Internal-Combustion Motors.

Description: Patent for a water heating attachment for internal combustion motors that will allow the cooling fluid in said motors to remain heated even when the motor is at rest, especially during freezing temperatures, including illustration.
Date: December 7, 1920
Creator: Clayton, Oscar B. & Oberwetter, George T.
Partner: UNT Libraries Government Documents Department

Well-Screen Cleaner.

Description: Patent for cleaning well screens and preventing oil well pipes from clogging to improve production.
Date: June 7, 1921
Creator: Bashara, Samuel F.
Partner: UNT Libraries Government Documents Department

Treatment of Crude Petroleum for Purification.

Description: Patent for the purification of crude petroleum by separating impurities such as sand and clay using a heat treatment.
Date: June 7, 1921
Creator: Bostick, Joseph Wallace & Homer, Charles H.
Partner: UNT Libraries Government Documents Department

Pump.

Description: Patent for a pump plunger for oil or water that is durable and will not require replacement.
Date: June 7, 1921
Creator: Humason, Granville A.
Partner: UNT Libraries Government Documents Department

Casing-Head

Description: Patent for a casing head that is specially adapted for "use in connection with well drilling for letting the tubing down into the bore, and in withdrawing the tubing from the bore." (Lines 15-16), including illustrations.
Date: September 7, 1920
Creator: McGarry, Henry S. & Carr, John D.
Partner: UNT Libraries Government Documents Department

Valve for Pumps.

Description: Patent of a valve used on deep well pumps; that my contain sand, shale or sediment
Date: June 7, 1921
Creator: Shevlin, Miles
Partner: UNT Libraries Government Documents Department

Pipe-Engaging Slip for Rotaries

Description: Patent for improving pipe engaging rotaries, with illustrations.
Date: June 7, 1921
Creator: Livergood, Gerald R.
Partner: UNT Libraries Government Documents Department
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