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Friedrich Oskar Giesel later independently isolated it in 1902 and , unaware that it was already known , gave it the name emanium .
 Friedrich Oskar Giesel
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Friedrich Oskar Giesel