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Preston tuners or machines ( also known as peacock , fan , or watchkey tuners ) is a type of machine head tuning system for string instruments , named for English cittern maker John Preston and developed in the 18th century .
 Preston, John Preston
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Preston, John Preston