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[Letter from J. P. Ross to C. C. Cox, January 21, 1921] (open access)

[Letter from J. P. Ross to C. C. Cox, January 21, 1921]

Letter from J. P. Ross to C. C. Cox offering $330 for a tract of timber. The envelope is included.
Date: January 23, 1921
Creator: Ross, J. P.
Object Type: Letter
System: The Portal to Texas History
Mouse and Rat Poisoner. (open access)

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
Object Type: Patent
System: The Portal to Texas History
Valve-Lifter For Automobiles (open access)

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.
Object Type: Patent
System: The Portal to Texas History
Rotary Well-Drilling Machine (open access)

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
Object Type: Patent
System: The Portal to Texas History