Google Books Ngram Viewer

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

1800 - 1947 1948 1949 - 1968 1969 - 1997 1998 - 2000 Chief Mechanical Officer English
1800 - 1917 1918 - 1940 1941 1942 - 1991 1992 - 2000 chief mechanical officer English
Run your own experiment! Raw data is available for download here.
© 2012 Google - Privacy & Terms - About Google - About Google Books - About Ngram Viewer