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<http://webisa.webdatacommons.org/163315731>	<http://www.w3.org/ns/prov#value>	"ng of radiographic pictures to improve picture denition, the present invention including improved procedures for making the diaphragm and comprising an extension of the invention disclosed in a co-pending application for United States Letters Patent Serial No. 331,014 iiled September 18, 1953 on the invention of Michael l." .