| http://www.w3.org/ns/prov#value | - Among the early forerunners of the gas mask was a device invented in 1847 by Lewis P. Haslett of Louisville, KY. Refs.: US Patent #6529 (1849); Smart (2000).In the early 1850s, the Scottish chemist John Stenhouse, who had been investigating the power of various forms of charcoal to capture and hold large volumes of gas, put the science to use in one of the first masks capable of removing toxic gas
|
