January 31 » Czechoslav Trade Union Association is founded in Prague.
July 2 » British-Italian engineer Guglielmo Marconi obtains a patent for radio in London.
July 11 » Salomon August Andrée leaves Spitsbergen to attempt to reach the North Pole by balloon. He later crashes and dies.
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.
December 6 » London becomes the world's first city to host licensed taxicabs.
Day of marriage January 23, 1934
The temperature on January 23, 1934 was between -6.4 °C and 3.4 °C and averaged -2.7 °C. There was 0.2 mm of rain. There was 6.1 hours of sunshine (71%). The average windspeed was 2 Bft (weak wind) and was prevailing from the south east. Source: KNMI
January 26 » The Apollo Theater reopens in Harlem, New York City.
February 23 » Leopold III becomes King of Belgium.
April 12 » The U.S. Auto-Lite strike begins, culminating in a five-day melee between Ohio National Guard troops and 6,000 strikers and picketers.
May 23 » The Auto-Lite strike culminates in the "Battle of Toledo", a five-day melée between 1,300 troops of the Ohio National Guard and 6,000 picketers.
August 11 » The first civilian prisoners arrive at the Federal prison on Alcatraz Island.
August 19 » The German referendum of 1934 approves Hitler's appointment as head of state with the title of Führer.
When copying data from this family tree, please include a reference to the origin: Edo Janssen, "Voorouders Janssen & de Groot", database, Genealogy Online (https://www.genealogieonline.nl/voorouders-janssen-en-de-groot/I36588.php : accessed August 7, 2025), "Pieter van Vollenhoven (1897-1977)".
Copy warning
Genealogical publications are copyright protected. Although data is often retrieved from public archives, the searching, interpreting, collecting, selecting and sorting of the data results in a unique product. Copyright protected work may not simply be copied or republished.
Please stick to the following rules
Request permission to copy data or at least inform the author, chances are that the author gives permission, often the contact also leads to more exchange of data.
Do not use this data until you have checked it, preferably at the source (the archives).
State from whom you have copied the data and ideally also his/her original source.