February 9 » The Davis Cup competition is established.
May 17 » The children's novel The Wonderful Wizard of Oz, by L. Frank Baum, is first published in the United States. The first copy is given to the author's sister.
June 14 » The second German Naval Law calls for the Imperial German Navy to be doubled in size, resulting in an Anglo-German naval arms race.
July 19 » The first line of the Paris Métro opens for operation.
October 19 » Max Planck discovers Planck's law of black-body radiation.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
Day of marriage June 18, 1925
The temperature on June 18, 1925 was between 4.7 °C and 16.3 °C and averaged 11.5 °C. There was 0.9 mm of rain. There was 5.7 hours of sunshine (34%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the northwest. Source: KNMI
In The Netherlands , there was from September 19, 1922 to August 4, 1925 the cabinet Ruys de Beerenbrouck II, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
In The Netherlands , there was from August 4, 1925 to March 8, 1926 the cabinet Colijn I, with Dr. H. Colijn (ARP) as prime minister.
April 4 » The Schutzstaffel (SS) is founded under Adolf Hitler's Nazi party in Germany.
May 30 » May Thirtieth Movement: Shanghai Municipal Police Force shoot and kill 13 protesting workers.
July 18 » Adolf Hitler publishes Mein Kampf.
July 25 » Telegraph Agency of the Soviet Union (TASS) is established.
August 5 » Plaid Cymru is formed with the aim of disseminating knowledge of the Welsh language that is at the time in danger of dying out.
August 9 » A train robbery takes place in Kakori, near Lucknow, India.
Day of death September 20, 1959
The temperature on September 20, 1959 was between 6.3 °C and 20.5 °C and averaged 14.1 °C. There was 4.8 hours of sunshine (39%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the northeast. Source: KNMI
January 8 » Charles de Gaulle is proclaimed as the first President of the French Fifth Republic.
January 30 » MSHans Hedtoft, said to be the safest ship afloat and "unsinkable" like the RMSTitanic, strikes an iceberg on her maiden voyage and sinks, killing all 95 aboard.
March 9 » The Barbie doll makes its debut at the American International Toy Fair in New York.
August 3 » Portugal's state police force PIDE fires upon striking workers in Bissau, Portuguese Guinea, killing over 50 people.
September 26 » Typhoon Vera, the strongest typhoon to hit Japan in recorded history, makes landfall, killing 4,580 people and leaving nearly 1.6 million others homeless.
December 3 » The current flag of Singapore is adopted, six months after Singapore became self-governing within the British Empire.
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/I22669.php : accessed March 16, 2026), "Otto Fuhrman (1900-1959)".
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