Caterpillar-Tractor. (open access)

Caterpillar-Tractor.

Patent for 1) a mechanism preventing the Caterpillar tractor's driving element from becoming clogged with mud; 2) a mechanism to regulate the force put on the wheels in relation to the weight of the tractor's load; 3) a mechanism to allow this regulation of force in relation the weight of the tractor's load to be manually adjustable; 4) a construction improvement to allow the tractor to be turned in a relatively short radius, including illustrations.
Date: May 7, 1918
Creator: Rountree, Joseph G.
System: The Portal to Texas History
Hog-Crate (open access)

Hog-Crate

Patent for a crate for use in shipping live pigs which allows for the free movement of the animal's legs while maintaining separation from other animals for identification purposes, including illustrations and instructions for use.
Date: April 16, 1918
Creator: Hirst, John A. & Hirst, Samuel L.
System: The Portal to Texas History