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WORLDKINGS - On This Day - May 19, 2022 - In 1857, the first U.S. patent for an "electromagnetic fire alarm telegraph for cities" was issued to William Francis Channing

18-05-2022

(Worldkings.org) William Francis Channing (February 22, 1820 – March 20, 1901) was an American activist, electrical researcher, scientist, physician, and inventor. He invented the first citywide electric fire alarm system. Channing worked with Alexander Graham Bell in developing the telephone.

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