Google Books Ngram Viewer

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

1800 - 1987 1988 - 2004 2005 - 2006 2007 2008 intellectual property English
1800 - 1879 1880 - 1978 1979 - 1986 1987 - 2002 2003 - 2008 copyright English
1800 - 1823 1824 - 1944 1945 - 1960 1961 - 1985 1986 - 2008 patent English
1800 - 1926 1927 - 1998 1999 - 2001 2002 - 2004 2005 - 2008 trademark English

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