Usage History of 'autogyros'

The following chart shows how frequently 'autogyros' appeared in printed materials over time. For example, the word 'autogyros' occurred 2 times in books in 1930 and 45 times in 2008. From 1930 to 2008, the word 'autogyros' was used a total of 3,515 times in books scanned by Google. See Reference: Google Ngram project.

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