K.S. Butler, foreman miner of the United States Bureau of Mines, demonstrates a modern McCaa oxygen apparatus which allows working in the deadliest of gas for a period of more than 2 1/2 hours. Watching the demonstration are County Fire Captains: John H. Carroll: W.H. Rowell; A.J. Kelly; William Heldorn; H.G. Wolf; and G.G. Griswold. G.M. Kintz at the extreme right is explaining the appratus. Photo dated: October 26, 1927.
Los Angeles (Calif.).--Fire Department United States.--Bureau of Mines Fire departments--California--Los Angeles Fire fighters--California--Los Angeles Breathing apparatus Herald-Examiner Collection photographs
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