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Hydraulic Swivel

Description: Patent for a new and useful improvement in hydraulic swivels by simplifying the structure and making the device more efficient and reliable.
Date: March 7, 1922
Creator: Black, Lee J.
Partner: UNT Libraries Government Documents Department

Still and Still-Setting

Description: Patent for steam still improvements using an open steel frame for support of the still. This steel frame allows for heating by methods other then steam and easy access to the bottom plates of the still to see if there is leakage.
Date: March 30, 1920
Creator: Henderson, Herbert
Partner: UNT Libraries Government Documents Department

Hydraulic Swivel.

Description: Patent for a hydraulic swivel valve, to allow water to flow to the drill stem for purposes of cooling and lubrication.
Date: March 22, 1921
Creator: Black, Lee J.
Partner: UNT Libraries Government Documents Department

Grain-Car.

Description: Patent for a grain car, with improved methods or loading and unloading the grain, as well as an easy method for converting the car to haul regular cargo.
Date: March 15, 1921
Creator: Dukes, Sandy
Partner: UNT Libraries Government Documents Department
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