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Hoisting Hook.
Patent for "certain new and useful Improvements in Hoisting-Hooks" (lines 5-6) including specifications and illustrations.
Date:
June 22, 1915
Creator:
Black, Lee J.
System:
The Portal to Texas History
Rotary Drilling Apparatus
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.
System:
The Portal to Texas History