A calibration system includes a plurality of printers, a grouping unit, a printer-selecting unit, a corrections data acquiring unit, a group determining unit, and a print-data creating unit. The window frame includes a first frame having a first side, a second side, an outer perimeter edge, and an inner perimeter edge. A second slew-rate enhancement circuit receives a second control voltage and outputs a second voltage. The first frame encapsulates a resource from a third-party internet based service. And then, the drive-pulse speed is changed in accordance with the detected drive-pulse speed to drive the pulse motor at a prescribed speed. The carriage may include adjustable mounting bracket means for attaching a lawn trimmer in various positions on the carriage base.