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in subjects: "Science and Technology - Tools"  
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Improvement in Wash-Boilers.

Description: Patent for "a new and valuable Improvement in Wash-Boilers" (lines 4-5) including illustrations.
Date: September 28, 1875
Creator: Mackli, Frank
Partner: UNT Libraries Government Documents Department

Plow.

Description: Patent for improvements in plows used for agricultural purposes with an illustration. This improvement in design is specific to "provid[ing] a plow capable of being adjusted to cause engagement thereof with the earth at varying depths" (lines 10-12).
Date: June 24, 1919
Creator: Marshall, Andrew Jackson
Partner: UNT Libraries Government Documents Department

Dental Bite-Tray.

Description: Patent for a bite tray usable for an array of mouth sizes. The material provides better comfort in the mouth of the patient, as well as better comfort for the operator.
Date: March 30, 1915
Creator: Sanders, Mastin E.
Partner: UNT Libraries Government Documents Department

Centrifugal Machine

Description: Patent for centrifugal machine. This invention is specific to centrifugal machines used as sugar-driers to separate the molasses from crystallized sugar.
Date: August 25, 1903
Creator: Kennon, James Daniel
Partner: UNT Libraries Government Documents Department

Barn-Door Lock

Description: Patent for a barn-door lock that "consists in certain novel features of construction, combination and arrangement of parts" (lines 34-37) and "which shall be simple, durable and efficient, and which may be manufactured and sold at a comparatively low cast" (lines 29-31).
Date: 191X
Creator: Henrichsen, F.R.
Partner: UNT Libraries Government Documents Department
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