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Marva Mullins
John Warnock, who helped invent the PDF and co-founded Adobe Systems, dies at age 82Sun Sentinel
‘One of the greatest inventors’: Father of the PDF, Adobe co-founder diesSydney Morning Herald
John Warnock, who helped invent the PDF and co-founded Adobe, dies aged 82Shropshire Star
John Warnock, who invented the PDF and co-founded Adobe Systems, dies at age 82Seattle Times
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