When What
1888 Thomas A Edison patented an Optical Phonograph (movie) projector.
1907 The Marconi company began commercial wireless service between Nova Scotia and Ireland.
1912 Serbia and Greece declared war on the Ottoman Empire over Macedonia. This was the First Balkan War and a prelude to World War I.
1949 Work began on the Snowy Mountain Hydro-Electric project, one of the wonders of modern engineering. It was built by post World War II immigrants and it is still powering the east coast of Australia. It was in part social engineering.
1973 OPEC embargoed oil sales to USA and other Israeli allies.
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