| http://www.w3.org/ns/prov#value | - Such a retractable syringe is shown, for example, in U.S. Pat. No. 4,747,830, issued May 31, 1988, to Walter W. Gloyer and Frederick G. Bright, also the inventors herein, the disclosure of which is hereby incorporated by reference as if fully recited herein, including the references to and citations of the state of the art.
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