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Drill-Bit

Description: Patent for an improved kind of drill bit that is more durable against rock. The bit's cutting rollers have a frusto-conical shape, and are also detachable.
Date: January 24, 1919
Creator: Humason, Granville A.
Partner: UNT Libraries Government Documents Department

Combined Rail-Anchor and Tie-Plate

Description: Patent for a combined rail anchor and tie plate. The purpose of the invention is to combine the aforementioned devices to prevent rails from cutting into the ties, overturning, and spreading.
Date: January 24, 1919
Creator: Johnson, Robert
Partner: UNT Libraries Government Documents Department
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