Self-Contained Breathing Device
From ETHW
The first known self-contained breathing device in the United States was used by the Anaconda Copper Mining Company in 1912. Early self-contained breathing devices were originally imported from Europe with roughly 8000 devices in use in United States mines by 1914, but the outbreak of WWI cut off the United States' supply. By 1915, W.E. Gibbs, an American mechanical engineer, was working on a self-contained breathing device prototype. By 1918, Edison Laboratories began selling the first U.S. manufactured self-contained breathing device.
