Google Books Ngram Viewer

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

1800 - 1974 1975 - 1996 1997 1998 1999 - 2000 intellectual property English
1800 - 1919 1920 - 1980 1981 - 1986 1987 - 1991 1992 - 2000 industrial property English

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