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Molding Apparatus.

Description: Patent for a molding apparatus for forming precast concrete units used for constructing monolithic straight and curved walls, floors, ceilings, and other building structures.
Date: October 31, 1922
Creator: Nelson, William E.
Partner: UNT Libraries Government Documents Department

Semaphore

Description: Patent for a semaphore in the form of a rotatable tubular post for the purpose of signaling traffic conditions at an intersection. The semaphore communicates signals in the form of red or green plates, red or green colored lamplight, and pneumatic whistles, which are triggered by vehicles passing over platforms installed on the road surface near the intersection by means of underground tubes containing chains and pulleys. The actuation of the semaphore is detailed in "parent" application, seria… more
Date: October 31, 1922
Creator: Durán, Arturo
Partner: UNT Libraries Government Documents Department
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