Usage History of 'wellheads'

The following chart shows how frequently 'wellheads' appeared in printed materials over time. For example, the word 'wellheads' occurred 6 times in books in 1818 and 441 times in 2008. From 1818 to 2008, the word 'wellheads' was used a total of 12,855 times in books scanned by Google. See Reference: Google Ngram project.

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