The temperature on July 18, 1914 was between 9.7 °C and 22.9 °C and averaged 17.8 °C. There was 11.4 hours of sunshine (70%). The average windspeed was 2 Bft (weak wind) and was prevailing from the west-southwest. Source: KNMI
In The Netherlands , there was from August 29, 1913 to September 9, 1918 the cabinet Cort van der Linden, with Mr. P.W.A. Cort van der Linden (liberaal) as prime minister.
April 9 » Mexican Revolution: One of the world's first naval/air skirmishes takes place off the coast of western Mexico.
July 18 » The U.S. Congress forms the Aviation Section, U.S. Signal Corps, giving official status to aircraft within the U.S. Army for the first time.
August 28 » World War I: The Royal Navy defeats the German fleet in the Battle of Heligoland Bight.
September 13 » World War I: The Battle of Aisne begins between Germany and France.
September 16 » World War I: The Siege of Przemyśl (present-day Poland) begins.
October 9 » World War I: The Siege of Antwerp comes to an end.
Day of death December 9, 1955
The temperature on December 9, 1955 was between 2.4 °C and 8.8 °C and averaged 5.4 °C. There was 7.3 mm of rain during 11.7 hours. The almost completely overcast was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
April 12 » The polio vaccine, developed by Dr. Jonas Salk, is declared safe and effective.
May 14 » Cold War: Eight Communist bloc countries, including the Soviet Union, sign a mutual defense treaty called the Warsaw Pact.
May 18 » Operation Passage to Freedom, the evacuation of 310,000 Vietnamese civilians, soldiers and non-Vietnamese members of the French Army from communist North Vietnam to South Vietnam following the end of the First Indochina War, ends.
June 14 » Chile becomes a signatory to the Buenos Aires copyright treaty.
September 16 » The military coup to unseat President Juan Perón of Argentina is launched at midnight.
December 8 » The Flag of Europe is adopted by Council of Europe.
When copying data from this family tree, please include a reference to the origin: W.J. Oving, "Family tree Oving", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-oving/I57730.php : accessed January 4, 2026), "Derk KELLER (1891-1955)".
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