printed reports relating to environmental risks associated with particular sites

Drift Indicator Instrument Designed for Use in Oil Well Drilling Operations, to Record in Degrees, the Variation from Vertical of the Hole Being Drilled, as Drilling Progresses

DRIFT INDICATOR RECORDER INSTRUMENT, DESIGNED FOR USE IN OIL WELL DRILLING OPERATIONS, TO RECORD IN DEGREES, THE VARIATION FROM VERTICAL, OF THE HOLE BEING DRILLED, AS DRILLING PROGRESSES