A method, system, and computer program product for using biometrics on pervasive devices for purposes of mobile identification. The method for fabricating ceiling fan blade raises yield rate and reduces labor cost. Projecting and depressed portions formed on each of the mud guards to prevent interference with the tail lamp are no longer necessary so that the mud guard is molded easily. A feedback circuit is arranged between the inverter and the lamps. The fitment has parallel guide surfaces to aid in alignment and traverse of the fitment in a manufacturing line where the fitment is installed and the pouch is filled. Before the processing-object substrate is plasma-processed, top-and-bottom surfaces of the processing-object substrate are simultaneously subjected to a weak plasma in gas composed mainly of inert gas, which makes it possible to neutralize the charges on the processing-object substrate.