January 18 » An X-ray generating machine is exhibited for the first time by H. L. Smith.
March 2 » The Battle of Adwa: The Italian Army defeated by the Ethiopian Army in Adwa, Tigray, Ethiopia.
May 18 » The United States Supreme Court rules in Plessy v. Ferguson that the "separate but equal" doctrine is constitutional.
May 26 » Charles Dow publishes the first edition of the Dow Jones Industrial Average.
May 26 » Nicholas II becomes the last Tsar of Imperial Russia.
November 27 » Also sprach Zarathustra by Richard Strauss is first performed.
Day of marriage April 17, 1920
The temperature on April 17, 1920 was between 5.3 °C and 14.1 °C and averaged 10.8 °C. There was 3.2 mm of rain. There was 1.7 hours of sunshine (12%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east-northeast. Source: KNMI
In The Netherlands , there was from September 9, 1918 to September 18, 1922 the cabinet Ruys de Beerenbrouck I, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
January 23 » The Netherlands refuses to surrender the exiled Kaiser Wilhelm II of Germany to the Allies.
March 8 » The Arab Kingdom of Syria, the first modern Arab state to come into existence, is established.
May 7 » Treaty of Moscow: Soviet Russia recognizes the independence of the Democratic Republic of Georgia only to invade the country six months later.
July 29 » Construction of the Link River Dam begins as part of the Klamath Reclamation Project.
August 20 » The first commercial radio station, 8MK (now WWJ), begins operations in Detroit.
November 15 » The Free City of Danzig is established.
Day of death April 17, 1960
The temperature on April 17, 1960 was between 3.0 °C and 11.6 °C and averaged 6.9 °C. There was 0.9 mm of rain during 1.2 hours. There was 5.6 hours of sunshine (40%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north. Source: KNMI
January 6 » The Associations Law comes into force in Iraq, allowing registration of political parties.
February 1 » Four black students stage the first of the Greensboro sit-ins at a lunch counter in Greensboro, North Carolina.
June 23 » The United States Food and Drug Administration declares Enovid to be the first officially approved combined oral contraceptive pill in the world.
July 28 » The German Volkswagen Act came into force.
August 6 » Cuban Revolution: Cuba nationalizes American and foreign-owned property in the nation.
When copying data from this family tree, please include a reference to the origin: Ton Dicker, "Dicker family tree", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-dicker/I2370.php : accessed February 25, 2026), "Regina Maria "Gina" Kupper (1896-1960)".
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