April 14 » James Cash Penney opens his first store in Kemmerer, Wyoming.
May 17 » Greek archaeologist Valerios Stais discovers the Antikythera mechanism, an ancient mechanical analog computer.
May 31 » Second Boer War: The Treaty of Vereeniging ends the war and ensures British control of South Africa.
June 28 » The U.S. Congress passes the Spooner Act, authorizing President Theodore Roosevelt to acquire rights from Colombia for the Panama Canal.
August 22 » Theodore Roosevelt becomes the first President of the United States to make a public appearance in an automobile.
October 24 » Guatemala's Santa María Volcano begins to erupt, becoming the third-largest eruption of the 20th century.
Day of death September 12, 1956
The temperature on September 12, 1956 was between 10.6 °C and 15.1 °C and averaged 13.0 °C. There was 0.5 hours of sunshine (4%). The heavily clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-northwest. Source: KNMI
March 9 » Soviet forces suppress mass demonstrations in the Georgian SSR, reacting to Nikita Khrushchev's de-Stalinization policy.
May 1 » The polio vaccine developed by Jonas Salk is made available to the public.
October 21 » The Mau Mau Uprising in Kenya is defeated.
November 2 » Hungarian Revolution: Imre Nagy requests UN aid for Hungary. Nikita Khrushchev meets with leaders of other Communist countries to seek their advice on the situation in Hungary, selecting János Kádár as the country's next leader on the advice of Josip Broz Tito.
December 2 » The Granma reaches the shores of Cuba's Oriente Province. Fidel Castro, Che Guevara and 80 other members of the 26th of July Movement disembark to initiate the Cuban Revolution.
December 4 » The Million Dollar Quartet (Elvis Presley, Jerry Lee Lewis, Carl Perkins, and Johnny Cash) get together at Sun Studio for the first and last time.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I136960.php : accessed October 22, 2026), "Martinus van der Kooy (1902-1956)".
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