Adolf Hitler became Führer of Germany following the death of President Paul von Hindenburg.
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Samuel Briggs and his son patented his nail-making machine.
Andrew Hallidie introduced the cable car to San Francisco after witnessing a horse and carriage accident.
Researchers in South Korea developed a tattoo that monitors a person's health.
English clockmaker Daniel Quare gained the patents for a portable barometer to measure air pressure.
English sea explorer Henry Hudson reached the Hudson Bay, which was named after him.
