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Mail Delivery Apparatus
Patent for improvements to mail delivery through sorting and distribution to different destinations with illustrations.
Date:
December 16, 1919
Creator:
Cobb, Albert C.
System:
The Portal to Texas History
Rotary Cutter for Roller Drills
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.
System:
The Portal to Texas History
Rotary Boring-Drill
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
System:
The Portal to Texas History