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While there were several intermediate steps ( H. Newbold appears to have designed a similar lens to Aves around 1913 ) , there is evidence to suggest that Duke Elder in 1922 developed the worlds first commercially available progressive lens ( Ultrifo ) sold by " Gowlland of Montreal " .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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