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Dredge.
Patent for an excavating machine specifically designed for canal digging, that "is an improvement upon a patent granted to Charles S. Butterfield, March 13, 197 and numbered 1,219,371" (lines 10-13). This invention provides a means for firm and stable support of the excavating machine and allows the position of the machine to be easily changed as the work progresses.
Date:
November 22, 1921
Creator:
Evans, Marvin
System:
The Portal to Texas History
Thermostatic Fire-Extinguishing Device
Patent for a thermostatic fire-extinguishing device that improves the efficiency and operation of thermostatic fire-extinguishers.
Date:
June 22, 1915
Creator:
Hooks, J. J.
System:
The Portal to Texas History