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Septic Tank

Description: Patent for Septic Tank for sewage disposal. This patent improves previous models, due to its easily instillation.
Date: April 8, 1913
Creator: Payne, George Ralph & Moore, Stewart
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.
Partner: UNT Libraries Government Documents Department
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