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Historian Helmut Gernsheim tracked down the photograph in 1952 , brought it to prominence again and established Niépce as the inventor of photography .
 Helmut Gernsheim, Niépce
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Helmut Gernsheim, Niépce