Usage History of 'pinhole'

The following chart shows how frequently 'pinhole' appeared in printed materials over time. For example, the word 'pinhole' occurred 4 times in books in 1703 and 14,982 times in 2008. From 1703 to 2008, the word 'pinhole' was used a total of 387,168 times in books scanned by Google. See Reference: Google Ngram project.

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