power-operated tools and accessories for use in the drilling and servicing of oil and gas wells; namely, downhole fluid mud motors, rotor-stators, bent subs, bent housings, alignment subs, orienting subs, bearing assemblies, drive shaft assemblies for transmitting torque from a downhole fluid mud motor to a bearing assembly and parts for the aforesaid goods

SOLID STATE HEAD PRESSURE CONTROL UNIT COMPRISING AN ELECTRONIC CIRCUIT AND A SENSOR ASSEMBLY FOR CONTROLLING THE TEMPERATURE AND FAN SPEED IN REFRIGERATION MACHINES AND THE LIKE

POWER SUUPPLY METER AND MONITORING SYSTEM