File:Wade-Dahl-Till valve (from patent application).png

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	02:45, 3 May 2011		330 × 500 (34 KB)	Rewinn	Wade-Dahl-Till valve illustration, from its patent application. It is not clear than any actual such valves still exist to be photographed, so this illustration may be the only such available. It is freely viewable at http://v3.espacenet.com/textdoc?DB=EP

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