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Two Starr-Edwards artificial cardiac valves, United States,... News Photo1900-1909,1979,20th Century Style,Artificial,Color Image,Healthcare And Medicine,Man Made,Medicine,Prosthetic Equipment,Retro Styled,UK,USA,VerticalPhotographer Collection: SSPL SSPL/Science MuseumUNITED KINGDOM - MAY 30: Two Starr-Edwards artificial cardiac valves, United States, 1978-1979. Two Starr-Edwards ball-type artificial mitral valves, plastic and metal, with sterile cases, made by Edwards Laboratories Inc., USA, c.1979. (Photo by Science & Society Picture Library/SSPL/Getty Images)