MSA All-Vision Diaphragm ChemOx Rebreather Mask
The MSA All-Vision Gas Mask was made for a variety of applications, including law enforcement and industrial use. This MSA Diaphragm Gas Mask, had two cheek exhale valves, a central speech diaphragm, and was used with a ChemOx rebreather system. This example was made by Mine Safety Appliances in the 1958.
BoM stamp on temple "BUREAU OF MINES APPROVAL 1309 MSA
Manufacturer stamp on cheek "M-S-A"
Manufacturer stamp on cheek "MSA"
Stamp under chin "(?)"
Stamp on chin "MSA (?) 33 21 (?)"
Date stamp inside mask "56/57/58"
Manufacturer and patent stamps on head harness "MINE SAFETY APPLIANCES CO. PITTSBURGH, PA." "FRONT STRAP TO BE PULLED LAST" "PATENTED NOV. 1, 1921"
ChemOx canister top view
ChemOx canister front view "PERMISSIBLE QUARTER HOUR CHEMOX OXYGEN GENERATING CANISTER "
ChemOx canister back view "THIS SIDE TOWARD YOU"
Box for "M.S.A. - CHEMOX OXYGEN BREATHING APPARATUS" "BUREAU OF MINES APPROVAL 1307"
Instructions for use and maintenance inside box lid