February 14 » Voting machines are approved by the U.S. Congress for use in federal elections.
March 6 » Bayer registers "Aspirin" as a trademark.
March 27 » Emilio Aguinaldo leads Filipino forces for the only time during the Philippine–American War at the Battle of Marilao River.
July 17 » NEC Corporation is organized as the first Japanese joint venture with foreign capital.
July 26 » Ulises Heureaux, the 27th President of the Dominican Republic, is assassinated.
Day of death June 20, 1980
The temperature on June 20, 1980 was between 9.6 °C and 15.1 °C and averaged 12.4 °C. There was 13.6 mm of rain during 3.0 hours. There was 3.4 hours of sunshine (20%). The heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
February 22 » Miracle on Ice: In Lake Placid, New York, the United States hockey team defeats the Soviet Union hockey team 4–3.
February 24 » The United States Olympic hockey team completes its Miracle on Ice by defeating Finland 4–2 to win the gold medal.
March 27 » The Norwegian oil platform Alexander L. Kielland collapses in the North Sea, killing 123 of its crew of 212.
May 18 » Students in Gwangju, South Korea begin demonstrations calling for democratic reforms.
October 29 » Demonstration flight of a secretly modified C-130 for an Iran hostage crisis rescue attempt ends in crash landing at Eglin Air Force Base's Duke Field, Florida leading to cancellation of Operation Credible Sport.
December 11 » The Comprehensive Environmental Response, Compensation, and Liability Act (Superfund) is enacted by the U.S. Congress.
When copying data from this family tree, please include a reference to the origin: J Eijsermans, "Eijsermans family tree", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-eijsermans/I310095.php : accessed January 17, 2026), "Joannes Cornelis Maria Verhoeven (1899-1980)".
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