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Internal-Combustion Engine.
Patent for an internal combustion engine, which can be run with less fuel and better control of the engine.
Date:
February 1, 1910
Creator:
Reaugh, Frank
System:
The Portal to Texas History
Perpetual Calendar.
Patent for the improvement of calendars to create easier-to-read and quicker-to-adjust. These calendars were to be able to be used no matter the month or year and would always be accurate.
Date:
February 1, 1921
Creator:
Jones, L. Walter
System:
The Portal to Texas History