Counties
2 Matching Results
Results open in a new window/tab.
Results:
1 - 2 of
2
Grain-Car.
Patent for a grain car, with improved methods or loading and unloading the grain, as well as an easy method for converting the car to haul regular cargo.
Date:
March 15, 1921
Creator:
Dukes, Sandy
System:
The Portal to Texas History
Hydraulic Swivel.
Patent for a hydraulic swivel valve, to allow water to flow to the drill stem for purposes of cooling and lubrication.
Date:
March 22, 1921
Creator:
Black, Lee J.
System:
The Portal to Texas History