20 October 1973 October 19, 2012 Author: Staff The Sydney Opera House is opened. Famous Words of Inspiration..."As a small businessperson, you have no greater leverage than the truth." John Greenleaf Whittier — Click here for more from John Greenleaf Whittier Related posts: 6 October 1973 8 March 1983 30 March 1981 11 August 1984 20 October 1967 Categories: History Tags: 1973, 20 October