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.

Stamp
Stamp

BoM stamp on temple "BUREAU OF MINES APPROVAL 1309 MSA

Stamp
Stamp

Manufacturer stamp on cheek "M-S-A"

Stamp
Stamp

Manufacturer stamp on cheek "MSA"

Stamp
Stamp

Stamp under chin "(?)"

Stamp
Stamp

Stamp on chin "MSA (?) 33 21 (?)"

Rubber stamp
Rubber stamp

Date stamp inside mask "56/57/58"

Rubber stamps
Rubber stamps

Manufacturer and patent stamps on head harness "MINE SAFETY APPLIANCES CO. PITTSBURGH, PA." "FRONT STRAP TO BE PULLED LAST" "PATENTED NOV. 1, 1921"

Canister
Canister

ChemOx canister top view

Canister
Canister

ChemOx canister front view "PERMISSIBLE QUARTER HOUR CHEMOX OXYGEN GENERATING CANISTER "