2 Matching Results
Results open in a new window/tab.
Results:
1 - 2 of
2
Building Construction
Patent for building construction that is new and a useful improvement to sleeping porch construction.
Date:
March 14, 1922
Creator:
Trost, Henry Charles
System:
The Portal to Texas History
Hydraulic Classifier.
Patent for hydraulic classifier for the treatment of ore. The invention subjects settling solid particles to a secondary classification and prevent the contamination of the settling solids before they are discharged.
Date:
March 21, 1922
Creator:
Allen, Charles
System:
The Portal to Texas History