| http://www.w3.org/ns/prov#value | - It is to be understood, however, that the appended drawings illustrate only a typical embodiment of this invention and,therefore, are not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments.IN THE DRAWINGSFIG. 1 is a sectional view of a dual closure type butterfly valve mechanism constructed in accordance with the teachings of the present inve
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