Resource Type
Counties
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Crude-Oil-Refining Process.
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.
System:
The Portal to Texas History
Monkey-Wrench.
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.
System:
The Portal to Texas History
Printing Rule and Slug and Type-Form.
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.
System:
The Portal to Texas History