Usage History of 'rubboard'

The following chart shows how frequently 'rubboard' appeared in printed materials over time. For example, the word 'rubboard' occurred 6 times in books in 1916 and 94 times in 2008. From 1916 to 2008, the word 'rubboard' was used a total of 1,129 times in books scanned by Google. See Reference: Google Ngram project.

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