The temperature on July 27, 1911 was between 10.8 °C and 29.0 °C and averaged 21.4 °C. There was 13.4 hours of sunshine (85%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south-southeast. Source: KNMI
April 29 » Tsinghua University, one of mainland China's leading universities, is founded.
July 1 » Germany despatches the gunship SMSPanther to Morocco, sparking the Agadir Crisis.
July 7 » The United States, UK, Japan, and Russia sign the North Pacific Fur Seal Convention of 1911 banning open-water seal hunting, the first international treaty to address wildlife preservation issues.
September 23 » Pilot Earle Ovington makes the first official airmail delivery in America under the authority of the United States Post Office Department
November 19 » The Doom Bar in Cornwall claimed two ships, Island Maid and Angele, the latter killing the entire crew except the captain.
December 29 » Mongolia gains independence from the Qing dynasty, enthroning 8th Jebtsundamba Khutughtu as Khagan of Mongolia.
Day of marriage October 28, 1935
The temperature on October 28, 1935 was between 5.4 °C and 13.7 °C and averaged 10.4 °C. There was 2.9 mm of rain during 4.1 hours. There was 4.6 hours of sunshine (46%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-northwest. Source: KNMI
January 11 » Amelia Earhart becomes the first person to fly solo from Hawaii to California.
May 27 » New Deal: The Supreme Court of the United States declares the National Industrial Recovery Act to be unconstitutional in A.L.A. Schechter Poultry Corp. v. United States, (295 U.S. 495).
July 5 » The National Labor Relations Act, which governs labor relations in the United States, is signed into law by President Franklin D. Roosevelt.
July 20 » Switzerland: A Royal Dutch Airlines plane en route from Milan to Frankfurt crashes into a Swiss mountain, killing thirteen.
July 28 » First flight of the Boeing B-17 Flying Fortress.
August 15 » Will Rogers and Wiley Post are killed after their aircraft develops engine problems during takeoff in Barrow, Alaska.
Day of death September 29, 1981
The temperature on September 29, 1981 was between 4.8 °C and 18.1 °C and averaged 11.0 °C. There was 9.8 hours of sunshine (83%). The partly clouded was. The average windspeed was 1 Bft (weak wind) and was prevailing from the west. Source: KNMI
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
In The Netherlands , there was from Friday, September 11, 1981 to Saturday, May 29, 1982 the cabinet Van Agt II, with Mr. A.A.M. van Agt (CDA) as prime minister.
January 17 » President of the Philippines Ferdinand Marcos lifts martial law eight years and five months after declaring it.
January 21 » Production of the iconic DeLorean sports car begins in Dunmurry, Northern Ireland, United Kingdom.
July 17 » A structural failure leads to the collapse of a walkway at the Hyatt Regency in Kansas City, Missouri, killing 114 people and injuring more than 200.
August 12 » The IBM Personal Computer is released.
September 15 » The John Bull becomes the oldest operable steam locomotive in the world when the Smithsonian Institution operates it under its own power outside Washington, D.C.
December 18 » First flight of the Russian heavy strategic bomber Tu-160, the world's largest combat aircraft, largest supersonic aircraft and largest variable-sweep wing aircraft built.
When copying data from this family tree, please include a reference to the origin: Rein Koning, "Family tree Koning - van Dulken", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-van-dulken/I321.php : accessed February 4, 2026), "Harm Koning (1911-1981)".
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