Usage History of 'geophones'

The following chart shows how frequently 'geophones' appeared in printed materials over time. For example, the word 'geophones' occurred 4 times in books in 1918 and 1,044 times in 2008. From 1918 to 2008, the word 'geophones' was used a total of 45,893 times in books scanned by Google. See Reference: Google Ngram project.

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