February 14 » Voting machines are approved by the U.S. Congress for use in federal elections.
March 6 » Bayer registers "Aspirin" as a trademark.
April 18 » The St. Andrew's Ambulance Association is granted a royal charter by Queen Victoria.
May 30 » Pearl Hart, a female outlaw of the Old West, robs a stage coach 30 miles southeast of Globe, Arizona.
December 11 » Second Boer War: In the Battle of Magersfontein the Boers commanded by general Piet Cronjé inflict a defeat on the forces of the British Empire commanded by Lord Methuen trying to relieve the Siege of Kimberley.
Day of marriage August 19, 1920
The temperature on August 19, 1920 was between 9.2 °C and 14.0 °C and averaged 12.4 °C. There was 15.9 mm of rain. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-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 » Zeta Phi Beta Sorority Incorporated was founded on the campus of Howard University.
March 19 » The United States Senate rejects the Treaty of Versailles for the second time (the first time was on November 19, 1919).
May 7 » Kiev Offensive: Polish troops led by Józef Piłsudski and Edward Rydz-Śmigły and assisted by a symbolic Ukrainian force capture Kiev only to be driven out by the Red Army counter-offensive a month later.
August 11 » The Latvian–Soviet Peace Treaty, which relinquished Russia's authority and pretenses to Latvia, is signed, ending the Latvian War of Independence.
August 18 » The Nineteenth Amendment to the United States Constitution is ratified, guaranteeing women's suffrage.
August 26 » The 19th amendment to United States Constitution takes effect, giving women the right to vote.
Day of death February 17, 1970
The temperature on February 17, 1970 was between -11.2 °C and 2.3 °C and averaged -4.3 °C. There was 4.6 mm of rain during 8.3 hours. The partly or heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south. Source: KNMI
March 28 » An earthquake strikes western Turkey at about 23:05 local time, killing 1,086 and injuring 1,260.
April 1 » President Richard Nixon signs the Public Health Cigarette Smoking Act into law, requiring the Surgeon General's warnings on tobacco products and banning cigarette advertising on television and radio in the United States, effective 1 January 1971.
April 22 » The first Earth Day is celebrated.
May 1 » Vietnam War: Protests erupt following the announcement by Richard Nixon that the U.S. and South Vietnamese forces would attack Vietnamese communists in a Cambodian Campaign.
August 15 » Patricia Palinkas becomes the first woman to play professionally in an American football game.
November 18 » U.S. President Richard Nixon asks the U.S. Congress for $155 million in supplemental aid for the Cambodian government.
When copying data from this family tree, please include a reference to the origin: A.T.J. Jongepier, "Family tree Jongepier", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-jongepier/I77.php : accessed February 3, 2026), "Willem Potkamp (1899-1970)".
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