Usage History of 'unthreading'

The following chart shows how frequently 'unthreading' appeared in printed materials over time. For example, the word 'unthreading' occurred 4 times in books in 1809 and 313 times in 2008. From 1809 to 2008, the word 'unthreading' was used a total of 4,381 times in books scanned by Google. See Reference: Google Ngram project.

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