Apparatus and method are provided for facilitating pumped, immersion-cooling of an electronic system having multiple different types of electronic components. The control device corrects the throttle opening amount at the automatic pressure increase control to decrease based on the number of time the automatic pressure increase control is performed. The invention further relates to a method for operating an exhaust post-treatment device. A plurality optical reflector elements are affixed to respective other plunger shafts. Devices to practice the method include sewing machines having a sewing head moveable relative to a workpiece and a control handle operably connected to the sewing head to move the sewing head relative to the workpiece, wherein the display showing a pattern to be sewn is mounted relative to the control handle for movement with the control handle.