| http://www.w3.org/ns/prov#value | - Whereas valve leaflets of heart valve prostheses, per se, are old in the art, (and are described for example in U.S. Pat. No. 4,276,658, the specification of which is expressly incorporated herein by reference) the manner of hingedly mounting the valve leaflets 14 in the herein described heart valve prosthesis 10 is new, and comprises the principal novel feature of the present invention.
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