Resource Type
Counties
3 Matching Results
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Tractor.
Patent for an improvement in tractors that allowed adjustment to the tread or allowed distance between traction elements.
Date:
February 10, 1920
Creator:
Franklin, Floyd P.
System:
The Portal to Texas History
Spring-Hub.
Patent for spring hubs in automobiles and other vehicles. This prevents jarring and jolting between the spindle and the wheel.
Date:
February 10, 1914
Creator:
Lasswell, William H.
System:
The Portal to Texas History
Educational Device.
Patent for improvements in educational device by providing “a simple and comparatively inexpensive one designed for teaching addition, multiplication, subtraction, and division and capable of enabling the same to be explained with greater ease and at the expenditure of much less energy of both pupil and teacher.” (Lines 12-18) Illustration is included.
Date:
February 10, 1903
Creator:
Williams, Willoughby Columbus
System:
The Portal to Texas History