An inverter has a measuring part that measures an operating time such as the time interval from when a command to start a specified operation by an associated system until a signal indicating the completion of the operation is received. The shot and gas stream are directed against a pliant coating. The first material and the second material include a wound treatment material consisting of at least one of an adhesive, a sealant andor a medicament. The cell wall portions have a thickness proportion to the cell portions of not less than 2% and not more than 40%.