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List of permissible self-contained oxygen breathing apparatus, gas masks, and hose masks
List of permissible self-contained oxygen breathing apparatus, gas masks, and hose masks
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Published Year
1930-1939 (2) *
Subject
Breathing apparatus (2)
Gas masks (2)
Mine rescue work--Equipment and supplies (2)
Respirators (Medical equipment) (2)
Self-contained self-rescuer (Mine rescue equipment) (2) *
