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Printing Rule and Slug and Type-Form.

Description: Patent for rules and slugs that are quickly and easily arranged and that lock securely to make a type form, including one illustration.
Date: January 4, 1921
Creator: Markwell, Andrew E.
Partner: UNT Libraries Government Documents Department

Monkey-Wrench.

Description: Patent for a monkey wrench that "can be adjusted for different sizes of nuts by the same hand which is using the wrench...and which may also be used as a pipe wrench" (lines 16-21).
Date: January 11, 1921
Creator: Kirkpatrick, Otey R.
Partner: UNT Libraries Government Documents Department

Crude-Oil-Refining Process.

Description: Patent for improvements in the crude oil refining processes and apparatuses. The invention focuses on creating an inexpensive and simplistic system that relies on temperature.
Date: January 25, 1921
Creator: Evans, Jewett G. P.
Partner: UNT Libraries Government Documents Department
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