January 30 » Archduke Crown Prince Rudolf of Austria, heir to the Austro-Hungarian crown, is found dead with his mistress Baroness Mary Vetsera in the Mayerling.
February 22 » President Grover Cleveland signs a bill admitting North Dakota, South Dakota, Montana and Washington as U.S. states.
May 6 » The Eiffel Tower is officially opened to the public at the Universal Exposition in Paris.
June 6 » The Great Seattle Fire destroys all of downtown Seattle.
August 13 » William Gray of Hartford, Connecticut is granted United States Patent Number 408,709 for "Coin-controlled apparatus for telephones."
September 23 » Nintendo Koppai (Later Nintendo Company, Limited) is founded by Fusajiro Yamauchi to produce and market the playing card game Hanafuda.
Day of marriage April 17, 1912
The temperature on April 17, 1912 was between 1.7 °C and 15.3 °C and averaged 9.6 °C. There was 11.8 hours of sunshine (84%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east. Source: KNMI
February 14 » The U.S. Navy commissions its first class of diesel-powered submarines.
March 6 » Italo-Turkish War: Italian forces become the first to use airships in war, as two dirigibles drop bombs on Turkish troops encamped at Janzur, from an altitude of 6,000 feet.
May 5 » Pravda, the "voice" of the Communist Party of the Soviet Union, begins publication in Saint Petersburg.
July 30 » Japan's Emperor Meiji dies and is succeeded by his son Yoshihito, who is now known as the Emperor Taishō.
September 28 » Corporal Frank S. Scott of the United States Army becomes the first enlisted man to die in an airplane crash.
October 24 » First Balkan War: The Battle of Kirk Kilisse concludes with a Bulgarian victory against the Ottoman Empire.
Day of death August 25, 1960
The temperature on August 25, 1960 was between 15.6 °C and 21.8 °C and averaged 18.2 °C. There was 3.5 mm of rain during 2.3 hours. There was 2.1 hours of sunshine (15%). The heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the southwest. Source: KNMI
April 21 » Brasília, Brazil's capital, is officially inaugurated. At 09:30, the Three Powers of the Republic are simultaneously transferred from the old capital, Rio de Janeiro.
May 1 » Cold War: U-2 incident: Francis Gary Powers, in a Lockheed U-2 spyplane, is shot down over the Sverdlovsk Oblast, Soviet Union, sparking a diplomatic crisis.
May 6 » More than 20million viewers watch the first televised royal wedding when Princess Margaret marries Anthony Armstrong-Jones at Westminster Abbey.
June 20 » The Mali Federation gains independence from France (it later splits into Mali and Senegal).
September 5 » Muhammad Ali (then known as Cassius Clay) wins the gold medal in the light heavyweight boxing competition at the Olympic Games in Rome.
November 2 » Penguin Books is found not guilty of obscenity in the trial R v Penguin Books Ltd, the Lady Chatterley's Lover case.
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/I709.php : accessed February 20, 2026), "Tonia de Groot (1889-1960)".
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