| http://www.w3.org/ns/prov#value | - However, plastic formed in this manner is a non-limiting example of a suitable material and the device may be fashioned from any suitable materials, for example styrene, acetal, polypropylene, etc.In the above examples, the main conduit is a substantially straight tube (102, 420) but the invention may be practiced with a main conduit of any suitable shape.
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