Usage History of 'trapdoors'

The following chart shows how frequently 'trapdoors' appeared in printed materials over time. For example, the word 'trapdoors' occurred 4 times in books in 1735 and 1,981 times in 2008. From 1735 to 2008, the word 'trapdoors' was used a total of 40,703 times in books scanned by Google. See Reference: Google Ngram project.

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