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His fever powder , which he patented in 1747 , was one of the most successful of 18th-century patent medicine s , though he is said to have " tarnished his image by patenting his powders , and falsifying their specification " .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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