Air Line Mask : A breathing apparatus with a long length of air hose attached either to a supply outside the contaminated area or to cylinders of compressed air within the area
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}