Usage History of 'tracer'

The following chart shows how frequently 'tracer' appeared in printed materials over time. For example, the word 'tracer' occurred 2 times in books in 1644 and 49,811 times in 2008. From 1644 to 2008, the word 'tracer' was used a total of 1,728,107 times in books scanned by Google. See Reference: Google Ngram project.

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