Usage History of 'electret'

The following chart shows how frequently 'electret' appeared in printed materials over time. For example, the word 'electret' occurred 2 times in books in 1897 and 659 times in 2008. From 1897 to 2008, the word 'electret' was used a total of 51,670 times in books scanned by Google. See Reference: Google Ngram project.

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