Usage History of 'focuser'

The following chart shows how frequently 'focuser' appeared in printed materials over time. For example, the word 'focuser' occurred 4 times in books in 1890 and 452 times in 2008. From 1890 to 2008, the word 'focuser' was used a total of 18,709 times in books scanned by Google. See Reference: Google Ngram project.

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