May 1 » Spanish–American War: Battle of Manila Bay: The Asiatic Squadron of the United States Navy destroys the Pacific Squadron of the Spanish Navy after a seven-hour battle. Spain loses all seven of its ships, and 381 Spanish sailors die. There are no American vessel losses or combat deaths.
August 11 » Spanish–American War: American troops enter the city of Mayagüez, Puerto Rico.
September 13 » Hannibal Goodwin patents celluloid photographic film.
October 18 » The United States takes possession of Puerto Rico from Spain.
December 10 » Spanish–American War: The Treaty of Paris is signed, officially ending the conflict.
December 26 » Marie and Pierre Curie announce the isolation of radium.
Day of death July 5, 1968
The temperature on July 5, 1968 was between 12.8 °C and 23.6 °C and averaged 18.2 °C. There was 9.2 hours of sunshine (55%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
January 7 » Surveyor Program: Surveyor 7, the last spacecraft in the Surveyor series, lifts off from launch complex 36A, Cape Canaveral.
June 11 » Lloyd J. Old identified the first cell surface antigens that could differentiate among different cell types.
July 26 » Vietnam War: South Vietnamese opposition leader Trương Đình Dzu is sentenced to five years hard labor for advocating the formation of a coalition government as a way to move toward an end to the war.
October 16 » Kingston, Jamaica is rocked by the Rodney riots, inspired by the barring of Walter Rodney from the country.
October 26 » Soviet cosmonaut Georgy Beregovoy pilots Soyuz 3 into space for a four-day mission.
December 21 » Apollo program: Apollo 8 is launched from the Kennedy Space Center, placing its crew on a lunar trajectory for the first visit to another celestial body by humans.
When copying data from this family tree, please include a reference to the origin: Hans Opperman, "Family tree Opperman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-opperman/I4096.php : accessed February 25, 2026), "Johannes Antonius Engels (1898-1968)".
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