This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of Title 17, Chapter 1, Section 105 of the US Code
({{Information
|Description Hufnagel Heart Valve in the collection of the National Museum of Health and Medicine (M-151.11214)=
|Source Historical Collections, National Museum of Health and Medicine, USA=
|Date 23AUG2010= ~~~~~
|)
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