২২ মে': বিভিন্ন সংশোধনসমূহৰ মাজৰ পাৰ্থক্য

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# 1762 – Sweden and Prussia sign the Treaty of Hamburg.

# 1849 – Future U.S. President Abraham Lincoln is issued a patent for an invention to lift boats, making him the only U.S. President to ever hold a patent.