Usage History of 'probes'

The following chart shows how frequently 'probes' appeared in printed materials over time. For example, the word 'probes' occurred 2 times in books in 1582 and 116,544 times in 2008. From 1582 to 2008, the word 'probes' was used a total of 3,024,951 times in books scanned by Google. See Reference: Google Ngram project.

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