50205
Conceived in 1937 , the machine was built by Iowa State College mathematics and physics professor John Vincent Atanasoff with the help of graduate student Clifford Berry .
 Iowa State College, John Vincent Atanasoff, Clifford Berry
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:
 Iowa State College, John Vincent Atanasoff, Clifford Berry