Usage History of 'autogyro'

The following chart shows how frequently 'autogyro' appeared in printed materials over time. For example, the word 'autogyro' occurred 2 times in books in 1907 and 122 times in 2008. From 1907 to 2008, the word 'autogyro' was used a total of 13,840 times in books scanned by Google. See Reference: Google Ngram project.

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