The temperature on May 22, 1911 was between 4.7 °C and 14.0 °C and averaged 9.2 °C. There was 3.1 hours of sunshine (19%). The average windspeed was 2 Bft (weak wind) and was prevailing from the northwest. Source: KNMI
February 18 » The first official flight with airmail takes place from Allahabad, United Provinces, British India (now India), when Henri Pequet, a 23-year-old pilot, delivers 6,500 letters to Naini, about 10 kilometres (6.2mi) away.
May 9 » The works of Gabriele D'Annunzio are placed in the Index of Forbidden Books by the Vatican.
May 15 » More than 300 Chinese immigrants are killed in the Torreón massacre when the forces of the Mexican Revolution led by Emilio Madero take the city of Torreón from the Federales.
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.
August 24 » Manuel de Arriaga is elected and sworn-in as the first President of Portugal.
November 1 » World's first combat aerial bombing mission takes place in Libya during the Italo-Turkish War. Second Lieutenant Giulio Gavotti of Italy drops several small bombs.
Day of death December 9, 1976
The temperature on December 9, 1976 was between 0.5 °C and 8.2 °C and averaged 4.7 °C. There was 4.4 hours of sunshine (56%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the west-southwest. Source: KNMI
In The Netherlands , there was from Friday, May 11, 1973 to Monday, December 19, 1977 the cabinet Den Uyl, with Drs. J.M. den Uyl (PvdA) as prime minister.
February 6 » In testimony before a United States Senate subcommittee, Lockheed Corporation president Carl Kotchian admits that the company had paid out approximately $3 million in bribes to the office of Japanese Prime Minister Kakuei Tanaka.
April 9 » The EMD F40PH diesel locomotive enters revenue service with Amtrak.
June 27 » Air France Flight 139 (Tel Aviv-Athens-Paris) is hijacked en route to Paris by the PLO and redirected to Entebbe, Uganda.
June 29 » The Conference of Communist and Workers Parties of Europe convenes in East Berlin.
July 17 » The opening of the Summer Olympics in Montreal is marred by 25 African teams boycotting the games because of New Zealand's participation. Contrary to rulings by other international sports organizations, the IOC had declined to exclude New Zealand because of their participation in South African sporting events during apartheid.
July 25 » Viking program: Viking 1 takes the famous Face on Mars photo.
When copying data from this family tree, please include a reference to the origin: Leo Koster, "Family tree Koster / Coster", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-koster-coster/I23489.php : accessed February 23, 2026), "Willem Plaisier (1911-1976)".
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