| http://www.w3.org/ns/prov#value | - Such a plunger is useful for other purposes when it is desired to provide a temporary radial expansion of a force exerting element, as for example in pressure forming a portion of a tube.The present invention is of special value for high frequency welding an internal end closure to a tubular container sleeve, especially where the body of the sleeve is of a material such as cardboard or plastic tha
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