Usage History of 'penlights'

The following chart shows how frequently 'penlights' appeared in printed materials over time. For example, the word 'penlights' occurred 2 times in books in 1948 and 113 times in 2008. From 1948 to 2008, the word 'penlights' was used a total of 2,769 times in books scanned by Google. See Reference: Google Ngram project.

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