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Among Matheson 's more notable accomplishments are the development of the lecture bottle , now used by virtually every major college and university in the world ; and the supply of ultra pure gases that served as standards for the first gas chromatograph s. In 1966 , Matheson acquired Grey Chemical of Gloucester , Massachusetts , USA , a producer of ultra-pure gas materials used in electronics manufacturing .
 Matheson, gas, Matheson, gas
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Matheson, gas, Matheson, gas