Usage History of 'undulators'

The following chart shows how frequently 'undulators' appeared in printed materials over time. For example, the word 'undulators' occurred 2 times in books in 1874 and 334 times in 2008. From 1874 to 2008, the word 'undulators' was used a total of 14,003 times in books scanned by Google. See Reference: Google Ngram project.

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