Complex algorithms and calculations such as multi-phase flow correlations, together with mathematical models which include the dynamic behavior of the wellbore or artificial lift equipment and the components therein are employed to derive or compute information relevant to production based upon actual measurements made during operation. A double adjustable upper attachment point used to attach cargo to personal parachute systems is also disclosed. before singulating the plurality of die on the IC wafer. The resistance variable layer has a first portion in a V-shape. A method is also presented to precisely control the amount of the gate insulating film to be etched using the EPD window technique. The catalyst cover is provided in a space between the catalytic device and a front wheel supported by a front fork provided at a front side of the vehicle body frame.