| http://www.w3.org/ns/prov#value | - While the members constituting the operation unit 3 except the connecting sheaths 39 a and 39 b and O-rings 50 a, 50 b, 55 a, and 55Sb maybe formed from various metals such as stainless steel and aluminum or various plastic materials such as polypropylene, ABS, polycarbonate, polyacetal, or polysulfone, desirably they should be made of a lightweight and rigid plastic material.
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