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Level.
Patent for improvements to levels to provide more reliable and accurate information. It is also stronger and more durable and is produced at a lower cost.
Date:
March 30, 1915
Creator:
Satterfield, John E.
System:
The Portal to Texas History
Eye Testing Device.
Patent for a neater and more attractive eye testing device, including illustrations.
Date:
November 30, 1915
Creator:
Jones, Aaron Leroy
System:
The Portal to Texas History