AJO breathing apparatus

AJO breathing apparatus

[¦a¦jā¦ō ′brēth·iŋ ‚ap·ə′rad·əs]
(mining engineering)
A breathing device consisting of a Siebe-Gorman mining gas mask with a small oxygen cylinder and a canister which neutralizes mining gases, such as carbon monoxide, sulfureted hydrogen, and nitrous fumes.