I think it's the name of a company.

The Geronimo safety slide was developed in the 1940's in Perry, Oklahoma and has remained there ever since. Geronimo today is still manufactured with the same quality materials and is designed to operate safely and dependably under all weather conditions.

The original Geronimo oil rig escape device is the proven escape mechanism for derricks that has been tested-by-use on thousands of wells all over the world.

Geronimo is the quickest, safest, escape seat for Derrick...Tower...or
Construction Job.

Grasp brake with right hand and straddle T-Bar. Push brake away from body to release brake. Finger-tip pressure will brake the Geronimo at any height.

http://www.geronimomanufacturing.com/about.htm

La Unidad Geronimo provee una manera rapida, controlada y segura para un descenso efectivo cuando sea necesario. Sin embargo a fin de asegurar su efectividad es necesario instalar la unidad correctamente y los empleados deberan saber como utilizarlo.

Asegurese que todos empleados que utilizaran este producto entienden el proposito de la unidad (a ser utilizado solo en caso de emergencia), como instalar y utilizar adecuadamente la Unidad. Asi como tambien como y cuando realizar la inspeccion de la unidad.


http://www.geronimomanufacturing.com/Geronimo Owners Manual ...

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Note added at 21 mins (2014-07-08 08:45:49 GMT)
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'Geronimo escape device' would be better.

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Note added at 23 mins (2014-07-08 08:48:39 GMT)
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Here's a photo of one:

http://www.geronimomanufacturing.com/

The rig hit the rear end of a pickup truck tailgate and then hit the ground. The derrick man was on the derrick board located 65 feet above ground and was wearing a safety belt that was secured to the derrick board. He fell with the rig to the ground. The pipes stacked to the west of the rig also fell with the rig. The pipes extended from the drilling rig floor to the back of the pickup truck that was damaged by the falling pipes. The derrick board, a white colored pipe structure on which the derrick man was standing was found among the pipes which had fallen on the tailgate of the pickup truck on the driver's side. The derrick board structure was tangled and twisted. There was no emergency escape line (geronimo line) on the rig.

http://www.cdc.gov/niosh/face/stateface/ok/98ok008.html