In a system having at least a first slot and a first header, at least one field is provided in the first header. In this configuration, the battery pack apparatus is divided into a first unit including the battery pack and the cooling medium feeding device and a second unit having the control section accommodated in a case. The difference between the actual and desired operating pressure is then processed to control the operation of the automatic choke to thereby controllably bleed pressurized fluidic materials out of the annulus thereby creating back pressure within the borehole. Furthermore, the desired attachment accuracy is secured and maintained by attaching the valve retaining member to the substrate by applying a photolithography process without using an adhesive agent. A master BMC is determined from all of the candidate BMCs, and the master BMC sends starting instructions to each peripheral BMC at a specified time interval, according to a preset start sequence. The method further provides depositing a metal-containing seed layer on the tungsten-containing barrier material and depositing a metal-containing layer over the metal-containing seed layer to fill the feature.