Electrically-Controlled Puller For Oil-Well Casings.
Description:
Patent for an improved oil well casing puller that has electromagnets that will lock against the inside of the casing and be pulled out of the well. The pulley within the casing can be used accordingly and can also be locked with the casing or released from it.
Date:
April 12, 1921
Creator:
Dooley, William D.
Item Type:
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Partner:
UNT Libraries Government Documents Department