OIL WELL DERRICK WITH GUIDE TRACK FOR TRAVELLING BLOCK DOLLY

An oil well derrick has two front legs and two downwardly diverging back legs. Cross braces rigidly connect the back legs and also rigidly connect the back legs to the front legs. The front legs extend downwardly from the top of the derrick in parallel relation for at least the major portion of the...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	HOMER J. WOOLSLAYER, CECIL JENKINS
Format:	Patent
Sprache:	eng
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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