Usage History of 'trimotor'

The following chart shows how frequently 'trimotor' appeared in printed materials over time. For example, the word 'trimotor' occurred 8 times in books in 1912 and 476 times in 2008. From 1912 to 2008, the word 'trimotor' was used a total of 22,562 times in books scanned by Google. See Reference: Google Ngram project.

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