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Impression Cake
Patent for a new type of impression cake meant for the creation of dental and other kinds of molds.
Date:
May 13, 1919
Creator:
Downie, James H.
System:
The Portal to Texas History
Construction of the Hulls of Concrete Ships.
Patent for "new and useful improvements in Construction of the Hulls of Concrete Ships" (lines 5-6). The improvements enable concrete hulls to be made efficiently, comparatively lightweight, and durable with a new form of rib reinforcement providing strength to withstand all strains of ocean travel.
Date:
May 13, 1919
Creator:
Holmgreen, Julius H.
System:
The Portal to Texas History