February 1 » Shinhan Bank, the oldest bank in South Korea, opens in Seoul.
April 30 » J. J. Thomson of the Cavendish Laboratory announces his discovery of the electron as a subatomic particle, over 1,800 times smaller than a proton (in the atomic nucleus), at a lecture at the Royal Institution in London.
July 2 » British-Italian engineer Guglielmo Marconi obtains a patent for radio in London.
August 2 » Anglo-Afghan War: The Siege of Malakand ends when a relief column is able to reach the British garrison in the Malakand states.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
September 1 » The Tremont Street Subway in Boston opens, becoming the first underground rapid transit system in North America.
Day of death April 11, 1977
The temperature on April 11, 1977 was between 1.2 °C and 8.8 °C and averaged 4.1 °C. There was 1.4 mm of rain during 0.9 hours. There was 3.5 hours of sunshine (26%). The partly or heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the west-northwest. Source: KNMI
In The Netherlands , there was from Friday, May 11, 1973 to Monday, December 19, 1977 the cabinet Den Uyl, with Drs. J.M. den Uyl (PvdA) as prime minister.
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.
January 19 » President Gerald Ford pardons Iva Toguri D'Aquino (a.k.a. "Tokyo Rose").
January 20 » Jimmy Carter is inaugurated the 39th President of the United States of America.
May 28 » In Southgate, Kentucky, the Beverly Hills Supper Club is engulfed in fire, killing 165 people inside.
July 24 » End of a four-day-long Libyan–Egyptian War.
August 13 » Members of the British National Front (NF) clash with anti-NF demonstrators in Lewisham, London, resulting in 214 arrests and at least 111 injuries.
November 25 » Former Senator Benigno Aquino, Jr., is found guilty by the Philippine Military Commission No. 2 and is sentenced to death by firing squad. He is later assassinated in 1983.
When copying data from this family tree, please include a reference to the origin: Toon Steenbergen, "Steenbergen family tree", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_steenbergen/I496.php : accessed January 18, 2026), "Johannes Petrus Riphagen (1897-1977)".
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