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AO was first envisioned by Horace W. Babcock in 1953 , but did not come into common usage in astronomical telescopes until advances in computer and detector technology during the 1990 s made it possible to calculate the compensation needed in real time .
 Horace W. Babcock
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Text: {0} 
Answer:
 Horace W. Babcock