Usage History of 'biotrons'

The following chart shows how frequently 'biotrons' appeared in printed materials over time. For example, the word 'biotrons' occurred 8 times in books in 1958 and 2 times in 2008. From 1958 to 2008, the word 'biotrons' was used a total of 266 times in books scanned by Google. See Reference: Google Ngram project.

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