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in subjects: "Business, Economics and Finance - Mining"  
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Tube-Mill.

Description: Patent for improvements in tube-mills (employed for ore and other substances) which is meant to help support and drive rotating drums or cylinders of the mills allowing for more full appearances.
Date: October 1, 1918
Creator: Bergman, Julius G.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Rock-Drill.

Description: Patent for a composite rock drill composed of granular metal or minerals held together in a binder to present sharp points for the efficient drilling of rock and other substances.
Date: April 1, 1913
Creator: Blackburn, Julian E.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Core-Discharge Apparatus.

Description: Patent for an Improvement in Core-Discharge Apparatus. It is meant to be used in connection with core drills in well or mine drilling. This improvement is meant to be carried to the surface by an air-lift pump.
Date: October 1, 1918
Creator: Carhichael, Robert E.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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