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Rotary Drilling Apparatus

Description: Patent for well drilling apparatus (commonly known as rotaries) with eliminated screws and nuts, and reduced minimum number of parts, and which provides a quickly and easily operable gripping device.
Date: June 22, 1915
Creator: Black, Lee J.
Partner: UNT Libraries Government Documents Department

Propelling or Power-Generating Mechanism.

Description: Patent for the constructions of a propelling machine of a vessel, which is provided an electric motor in an engine as a power source for propelling the vessel.
Date: July 22, 1913
Creator: Caldwell, John C.
Partner: UNT Libraries Government Documents Department

Hoisting Hook.

Description: Patent for "certain new and useful Improvements in Hoisting-Hooks" (lines 5-6) including specifications and illustrations.
Date: June 22, 1915
Creator: Lee J. Black
Partner: UNT Libraries Government Documents Department