The Skylab 4 mission was launched by NASA, taking a crew of three astronauts to the US space station.
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The Soviet Union's Venera 3 space probe was launched from the Baikonur Cosmodrome.
Oklahoma became the 46th state to join the United States of America.
Nineteen countries vowed to gradually phase out coal at the United Nations Summit in Bonn, Germany.
The city of Havana, Cuba, celebrated its 500th birthday.
The Model M Postage Meter was put into commercial use.
