A data search device that is provided in a communication apparatus detects a memory area storing data to be transmitted from a memory unit having memory areas defined by IDs allotted to data. At least one of the top surfaces has an undulated profile for frictionally engaging and positively securing a cable at a desired location when the retainer is placed in a closed position. 70 and block copolymer containing block of the syndiotactic polypropylene and block of poly andor poly are obtained. Anode contamination is prevented by switching the electrode charge bias to negative in the presence of a gas, a plasma is generated proximal to the anode electrode to clean deposited contaminants from the anode electrode.