Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1800 - 1918 1919 - 1969 1970 1971 - 2001 2002 - 2008 subtracter English
1800 - 1952 1953 - 1969 1970 - 1971 1972 - 1996 1997 - 2008 subtractor English

Run your own experiment! Raw data is available for download here.
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