January 31 » Czechoslav Trade Union Association is founded in Prague.
May 26 » The original manuscript of William Bradford's history, "Of Plymouth Plantation" is returned to the Governor of Massachusetts by the Bishop of London after being taken during the American Revolutionary War.
June 16 » A treaty annexing the Republic of Hawaii to the United States is signed; the Republic would not be dissolved until a year later.
July 2 » British-Italian engineer Guglielmo Marconi obtains a patent for radio in London.
July 26 » Anglo-Afghan War: The Pashtun fakir Saidullah leads an army of more than 10,000 to begin a siege of the British garrison in the Malakand Agency of the North West Frontier Province of India.
September 11 » After months of pursuit, generals of Menelik II of Ethiopia capture Gaki Sherocho, the last king of Kaffa, bringing an end to that ancient kingdom.
Day of death April 20, 1953
The temperature on April 20, 1953 was between 1.6 °C and 15.7 °C and averaged 9.4 °C. There was 13.2 hours of sunshine (93%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the east-northeast. Source: KNMI
February 28 » James Watson and Francis Crick announce to friends that they have determined the chemical structure of DNA; the formal announcement takes place on April 25 following publication in April's Nature (pub. April 2).
April 24 » Winston Churchill is knighted by Queen Elizabeth II.
May 25 » Nuclear weapons testing: At the Nevada Test Site, the United States conducts its first and only nuclear artillery test.
May 25 » The first public television station in the United States officially begins broadcasting as KUHT from the campus of the University of Houston.
August 10 » First Indochina War: The French Union withdraws its forces from Operation Camargue against the Viet Minh in central Vietnam.
September 13 » Nikita Khrushchev is appointed General Secretary of the Communist Party of the Soviet Union.
When copying data from this family tree, please include a reference to the origin: P. Heres, "Family tree Haverkamp", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-haverkamp/I1099520147.php : accessed May 22, 2024), "Cornelis Adrianus Kools (1897-1953)".
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