| http://www.w3.org/ns/prov#value | - The piston 342 of the so-called doughnut shape made of an elastic material such as silicone rubber, NBR rubber, or the like and having a through hole in the center is set between these flange portions 343C, 343D. Of course, the cylinder 321 and piston 342 are of a cylindrical shape, the outside diameter of the piston 342 is greater than the inside diameter of the cylinder 321, and there is a certa
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