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Hydraulic Pressure and Time Indicator

Description: Patent for hydraulic pressure and time indicator for "recording the times when hydraulic cylinders are in operation and to indicate when the cylinders commence work or reach the required pressure" (lines 10 - 14).
Date: December 24, 1918
Creator: Helm, Clyde D.
Partner: UNT Libraries Government Documents Department

Building Tile.

Description: Patent for "hollow blocks" or "tile and hollow corner blocks" that "prevent moisture from passing through walls" (lines 10-14).
Date: December 31, 1918
Creator: Bennett, Walter R.
Partner: UNT Libraries Government Documents Department
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