Oldest
The Wright brothers are granted U.S. patent number 821,393 for their "Flying-Machine".
World War I: Start of the Battle of Mont Saint-Quentin, a successful assault by the Australian Corps during the Hundred Days Offensive.
Tay Bridge disaster: The central part of the Tay Rail Bridge in Dundee, Scotland, United Kingdom collapses as a train passes over it, killing 75.
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