Usage History of 'photomask'

The following chart shows how frequently 'photomask' appeared in printed materials over time. For example, the word 'photomask' occurred 2 times in books in 1958 and 1,103 times in 2008. From 1958 to 2008, the word 'photomask' was used a total of 28,328 times in books scanned by Google. See Reference: Google Ngram project.

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