January 18 » An X-ray generating machine is exhibited for the first time by H. L. Smith.
March 1 » Henri Becquerel discovers radioactive decay.
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.
June 2 » Guglielmo Marconi applies for a patent for his wireless telegraph.
November 17 » The Western Pennsylvania Hockey League, which later became the first ice hockey league to openly trade and hire players, began play at Pittsburgh's Schenley Park Casino.
December 30 » Canadian ice hockey player Ernie McLea scores the first hat-trick in Stanley Cup play, and the Cup-winning goal as the Montreal Victorias defeat the Winnipeg Victorias 6–5.
Day of marriage May 20, 1925
The temperature on May 20, 1925 was between 11.7 °C and 22.4 °C and averaged 16.2 °C. There was 11.1 hours of sunshine (70%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the southwest. 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.
January 3 » Benito Mussolini announces he is taking dictatorial powers over Italy.
January 21 » Albania declares itself a republic.
March 16 » An earthquake occurs in Yunnan, China.
May 25 » Scopes Trial: John T. Scopes is indicted for teaching human evolution in Tennessee.
June 16 » The most famous Young Pioneer camp of the Soviet Union, Artek, is established.
July 18 » Adolf Hitler publishes Mein Kampf.
Day of death July 28, 1963
The temperature on July 28, 1963 was between 8.5 °C and 21.1 °C and averaged 15.5 °C. There was 14.2 hours of sunshine (90%). The almost cloudless was. The average windspeed was 2 Bft (weak wind) and was prevailing from the northeast. Source: KNMI
April 24 » Marriage of Princess Alexandra of Kent to Angus Ogilvy at Westminster Abbey in London.
June 3 » Soldiers of the South Vietnamese Army attack protesting Buddhists in Huế with liquid chemicals from tear-gas grenades, causing 67 people to be hospitalized for blistering of the skin and respiratory ailments.
June 20 » Following the Cuban Missile Crisis, the Soviet Union and the United States sign an agreement to establish the so-called "red telephone" link between Washington and Moscow.
June 24 » The United Kingdom grants Zanzibar internal self-government.
October 10 » France cedes control of the Bizerte naval base to Tunisia.
November 22 » U.S. President John F. Kennedy is assassinated and Texas Governor John Connally is seriously wounded by Lee Harvey Oswald, who also kills Dallas Police officer J. D. Tippit after fleeing the scene. U.S Vice President Lyndon B. Johnson is sworn in as the 36th President of the United States afterwards.
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/I74496.php : accessed March 12, 2026), "Jantje de Groot (1896-1963)".
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