A fastener includes a bolt, a ring engaged around the bolt, and a coil spring. An embodiment of the invention embraces compounds of the formula I: 1and the pharmaceutically tolerated salts thereof. Compressed encoded control data generated at the ECC engine is stored as a codeword at the memory array. The output shafts may be enclosed within pivotable housings. Therefore, the water-absorbent sheet composition of the present invention is used as an absorbent material for sanitary napkins and incontinence pads, whereby a hygienic material not only that is thin and has excellent external design, but also free from inconveniences such as liquid leakage can be provided. A TiN film 71 and a W film 72 are deposited on a silicon oxide film 64 including the inside of a via-hole 66 by the CVD method and thereafter, the W film 72 and TiN film 71 on the silicon oxide film 64 are etched back to leave only the inside of the via-hole 66 and form a plug 73.