Google Books Ngram Viewer

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

1820 - 1912 1913 - 1975 1976 - 1984 1985 - 1992 1993 - 2000 telephone English
1820 - 1867 1868 - 1912 1913 - 1921 1922 - 1964 1965 - 2000 telegraph English
1820 - 1994 1995 - 1997 1998 1999 2000 internet English
1820 - 1934 1935 - 1941 1942 - 1945 1946 - 1991 1992 - 2000 radio English

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