Google Books Ngram Viewer

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

1776 - 1797 1798 - 1946 1947 - 1961 1962 - 1986 1987 - 2008 patents English
1776 - 1870 1871 - 1983 1984 - 1992 1993 - 2000 2001 - 2008 copyright English
1776 - 1985 1986 - 2003 2004 - 2005 2006 - 2007 2008 intellectual property English
1776 - 1920 1921 - 1997 1998 - 2001 2002 - 2005 2006 - 2008 trademark English

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