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Mail Delivery Apparatus

Description: Patent for improvements to mail delivery through sorting and distribution to different destinations with illustrations.
Date: December 16, 1919
Creator: Cobb, Albert C.
Partner: UNT Libraries Government Documents Department

Rotary Cutter for Roller Drills

Description: Patent for an improvement in rotary cutters for roller-drills. Improvement includes a secure locking mechanism upon bushing as it is related to author's prior patent for drill cutters.
Date: June 16, 1919
Creator: Godbold, Louis A.
Partner: UNT Libraries Government Documents Department

Rotary Boring-Drill

Description: Patent for rotary boring-drill attachment for a rotary drill stem for drilling oil or water wells.
Date: September 16, 1919
Creator: Hughes, Howard R
Partner: UNT Libraries Government Documents Department
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