Usage History of 'flashboards'

The following chart shows how frequently 'flashboards' appeared in printed materials over time. For example, the word 'flashboards' occurred 2 times in books in 1808 and 196 times in 2008. From 1808 to 2008, the word 'flashboards' was used a total of 9,285 times in books scanned by Google. See Reference: Google Ngram project.

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