January 18 » An X-ray generating machine is exhibited for the first time by H. L. Smith.
May 18 » The United States Supreme Court rules in Plessy v. Ferguson that the "separate but equal" doctrine is constitutional.
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.
July 28 » The city of Miami, Florida is incorporated.
December 10 » Alfred Jarry's Ubu Roi premieres in Paris. A riot breaks out at the end of the performance.
December 30 » Filipino patriot and reform advocate José Rizal is executed by a Spanish firing squad in Manila.
Day of marriage March 30, 1921
The temperature on March 30, 1921 was between 2.1 °C and 9.7 °C and averaged 5.5 °C. There was 1.6 mm of rain. There was 5.6 hours of sunshine (44%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south-southwest. 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.
March 8 » Spanish Prime Minister Eduardo Dato Iradier is assassinated while exiting the parliament building in Madrid.
April 2 » The Autonomous Government of Khorasan, a military government encompassing the modern state of Iran, is established.
July 23 » The Communist Party of China (CPC) is established at the founding National Congress.
September 5 » Roscoe "Fatty" Arbuckle party in San Francisco ends with the death of the young actress Virginia Rappe: One of the first scandals of the Hollywood community.
October 29 » The Link River Dam, a part of the Klamath Reclamation Project, is completed.
November 11 » The Tomb of the Unknowns is dedicated by US President Warren G. Harding at Arlington National Cemetery.
Day of death January 7, 1928
The temperature on January 7, 1928 was between 0.4 °C and 8.1 °C and averaged 4.4 °C. There was 2.9 mm of rain. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
June 9 » Charles Kingsford Smith completes the first trans-Pacific flight in a Fokker Trimotor monoplane, the Southern Cross.
September 1 » Ahmet Zogu declares Albania to be a monarchy and proclaims himself king.
September 28 » Alexander Fleming notices a bacteria-killing mold growing in his laboratory, discovering what later became known as penicillin.
November 22 » The premier performance of Ravel's Boléro takes place in Paris.
December 6 » The government of Colombia sends military forces to suppress a month-long strike by United Fruit Company workers, resulting in an unknown number of deaths.
December 17 » Indian revolutionaries Bhagat Singh, Sukhdev Thapar and Shivaram Rajguru assassinate British police officer James Saunders in Lahore, Punjab, to avenge the death of Lala Lajpat Rai at the hands of the police. The three were executed in 1931.
When copying data from this family tree, please include a reference to the origin: Hendrik de Graaf, "Family tree Plugboer", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-plugboer/I9811.php : accessed February 15, 2026), "Theodorus Hendrikus Koppendrayer (1896-1928)".
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