Template:Selected anniversaries/June 20
1840: Samuel Morse receives the patent for the telegraph.
1875: Inventor and engineer Wilhelm Bauer dies. He designed and built several hand-powered submarines.
1876: Adventurer and alleged "Pirate of the Prairie" Wallace War-Heels says that he has "offered no man violence", but admits that he has "responded to violence with greater violence, many times."
1877: Alexander Graham Bell installs the world's first commercial telephone service in Hamilton, Ontario, Canada.
1945: The United States Secretary of State approves the transfer of Wernher von Braun and his team of Nazi rocket scientists to the U.S. under Operation Paperclip.
2010: Unlicensed Extract of Radium factory accidentally releases self-sustaining colony of transdimensional corporations.
2017: Chromatographic analysis of Ursa Nano reveals a previously unknown shade of blue, "probably as a result of latest cryptographic numina."