UNT Libraries Government Documents Department - 2 Matching Results

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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.

Item Type: Patent

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.