MECHANICAL INSTRUMENT FOR RECORDING DATA CONCERNING WELL DRILLING OPERATIONS, SUCH AS DRILLING TIME IN MINUTES PER FOOT, ROUND TRIP TIME FOR CHANGING BITS AND ADDING JOINTS, SHUTDOWN TIME AND THE LIKE

A MECHANICAL INSTRUMENT FOR RECORDING DATA CONCERNING WELL DRILLING OPERATIONS, SUCH AS DRILLING TIME IN MINUTES PER FOOT, ROUND TRIP TIME FOR CHANGING BITS AND ADDING JOINTS, SHUT-DOWN TIME AND THE LIKE; PRESSURE GAUGES, PRESSURE TRANSMITTERS, LEVEL TRANSMITTERS, INSTRUMENTATION CONSOLES AND FLOW TRANSMITTERS, ALL FOR USE IN THE WELL DRILLING INDUSTRY

MECHANICAL WELL LOGGING INSTRUMENTS