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Lewis Phectic Haslett was an American inventor and the first person to receive a patent (US 6529  , "Inhaler or Lung Protector") for an early form of the gas mask in 1849.

References

1. Christianson, Scott (2010). Fatal Airs: The Deadly History and Apocalyptic Future of Lethal Gases that Threaten Our World. ABC-CLIO. ISBN 9780313385520.

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