Usage History of 'collimators'

The following chart shows how frequently 'collimators' appeared in printed materials over time. For example, the word 'collimators' occurred 4 times in books in 1844 and 2,204 times in 2008. From 1844 to 2008, the word 'collimators' was used a total of 78,110 times in books scanned by Google. See Reference: Google Ngram project.

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