January 31 » Czechoslav Trade Union Association is founded in Prague.
April 18 » The Greco-Turkish War is declared between Greece and the Ottoman Empire.
July 2 » British-Italian engineer Guglielmo Marconi obtains a patent for radio in London.
September 1 » The Tremont Street Subway in Boston opens, becoming the first underground rapid transit system in North America.
September 10 » Lattimer massacre: A sheriff's posse kills 19 unarmed striking immigrant miners in Lattimer, Pennsylvania, United States.
December 30 » The British Colony of Natal annexes Zululand.
Day of death April 28, 1967
The temperature on April 28, 1967 was between 4.6 °C and 13.9 °C and averaged 8.9 °C. There was 0.4 mm of rain during 1.1 hours. There was 9.2 hours of sunshine (63%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the north-northeast. Source: KNMI
March 12 » Suharto takes power from Sukarno when the People's Consultative Assembly inaugurate him as Acting President of Indonesia.
May 17 » Six-Day War: President Gamal Abdel Nasser of Egypt demands dismantling of the peace-keeping UN Emergency Force in Egypt.
May 27 » The U.S. Navy aircraft carrier USSJohn F. Kennedy is launched by Jacqueline Kennedy and her daughter Caroline.
May 30 » The Nigerian Eastern Region declares independence as the Republic of Biafra, sparking a civil war.
July 1 » Merger Treaty: The European Community is formally created out of a merger with the Common Market, the European Coal and Steel Community, and the European Atomic Energy Commission.
November 30 » The Pakistan Peoples Party is founded by Zulfikar Ali Bhutto, who becomes its first chairman.
When copying data from this family tree, please include a reference to the origin: Hendrik de Graaf, "Family tree Plugboer", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-plugboer/I3426.php : accessed March 16, 2026), "Cornelis Langeberg (1897-1967)".
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