Usage History of 'sparkplug'

The following chart shows how frequently 'sparkplug' appeared in printed materials over time. For example, the word 'sparkplug' occurred 6 times in books in 1905 and 881 times in 2008. From 1905 to 2008, the word 'sparkplug' was used a total of 26,395 times in books scanned by Google. See Reference: Google Ngram project.

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