Google Books Ngram Viewer

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

1950 - 1977 1978 - 1985 1986 1987 - 1999 2000 zentrale verarbeitungseinheit German
1950 - 1969 1970 - 1990 1991 - 1993 1994 - 1997 1998 - 2000 arbeitsspeicher German
1950 - 1987 1988 - 1997 1998 1999 2000 festplatte German

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