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.
April 6 » In Athens, the opening of the first modern Olympic Games is celebrated, 1,500 years after the original games are banned by Roman emperor Theodosius I.
April 15 » Closing ceremony of the Games of the I Olympiad in Athens, Greece.
May 26 » Nicholas II becomes the last Tsar of Imperial Russia.
June 28 » An explosion in the Newton Coal Company's Twin Shaft Mine in Pittston, Pennsylvania results in a massive cave-in that kills 58 miners.
Day of marriage July 30, 1921
The temperature on July 30, 1921 was between 12.3 °C and 21.2 °C and averaged 16.3 °C. There was 9.4 hours of sunshine (60%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-northwest. 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 16 » The Marxist Left in Slovakia and the Transcarpathian Ukraine holds its founding congress in Ľubochňa.
February 21 » Constituent Assembly of the Democratic Republic of Georgia adopts the country's first constitution.
March 21 » The New Economic Policy is implemented by the Bolshevik Party in response to the economic failure as a result of war communism.
June 28 » Serbian King Alexander I proclaims the new constitution of the Kingdom of Serbs, Croats and Slovenes, known thereafter as the Vidovdan Constitution.
September 21 » A storage silo in Oppau, Germany, explodes, killing 500–600 people.
November 14 » The Communist Party of Spain is founded, and issues the first edition of Mundo obrero.
When copying data from this family tree, please include a reference to the origin: Joop Klavers, "Family tree Klavers", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_klavers/I85271.php : accessed February 26, 2026), "Hendrik Albert Karssiens (1896-????)".
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