| http://www.w3.org/ns/prov#value | - A lifting device which can be adjusted to desired heights and fixed in position, as previously proposed, has the advantage of being smooth surfaced on its exterior so that it can be conveniently and readily built into an article with which it is to be used, for example the base of a chair. lts overall structural length only insignificantly exceeds the length of the displacement path of its piston
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