January 31 » Czechoslav Trade Union Association is founded in Prague.
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 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
August 21 » Oldsmobile, an American automobile manufacturer and marque, is founded.
August 31 » Thomas Edison patents the Kinetoscope, the first movie projector.
When copying data from this family tree, please include a reference to the origin: Johan Arie Eykelhoff, "Family tree Eykelhoff, Eijkelhoff", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-eykelhoff-eijkelhoff/I439.php : accessed January 11, 2026), "Helena Cornelia Costerus (1897-????)".
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