MIL-R-17729C, MILITARY SPECIFICATION: RESPIRATOR OUTFIT, SUPPLIED-AIR TWO-MAN (28-NOV-1972) [NO S/S DOCUMENT]

MIL-R-17729C, MILITARY SPECIFICATION: RESPIRATOR OUTFIT, SUPPLIED-AIR TWO-MAN (28-NOV-1972) [NO S/S DOCUMENT]., This specification covers a portable respirator outfit designed to supply uncontaminated air to two men working in a confined area that has a low oxygen potential or a high concentration of dust, gas, or fumes.