31774
It was the site of the experiments by Sidney Gilchrist Thomas and his cousin Percy Gilchrist that led to " the basic steel process " or " Gilchrist-Thomas process " .
 Sidney Gilchrist Thomas, Percy Gilchrist
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:
 Sidney Gilchrist Thomas, Percy Gilchrist