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Seed drills of earlier centuries included single-tube seed drills in Sumer and multi-tube seed drills in China , and later a seed drill by Jethro Tull that was influential in the growth of farming technology in recent centuries .
 Sumer, China, Jethro Tull
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Sumer, China, Jethro Tull