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Mouse and Rat Poisoner.
Patent for mouse and rat poison. This is a device meant for mice and rats that has bait for the purpose of poisoning these animals. This device prevents access from other animals.
Date:
October 11, 1921
Creator:
Vaden, Willie T. Jr
System:
The Portal to Texas History
Valve-Lifter For Automobiles
Patent for improvement in valve-lifters for automobiles. The object of the device is to compress a spring of the intake and exhaust valves of an automobile. Also for the quick removal of the valve.
Date:
February 15, 1921
Creator:
Patterson, George G.
System:
The Portal to Texas History
Rotary Well-Drilling Machine
Patent for a rotary well-drilling machine that makes use of an "independently rotatable section" to aid in the screwing and unscrewing of pipe sections.
Date:
August 9, 1921
Creator:
Taylor, William Henry
System:
The Portal to Texas History