Usage History of 'flashboard'

The following chart shows how frequently 'flashboard' appeared in printed materials over time. For example, the word 'flashboard' occurred 2 times in books in 1855 and 84 times in 2008. From 1855 to 2008, the word 'flashboard' was used a total of 3,639 times in books scanned by Google. See Reference: Google Ngram project.

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