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U.S. Army M3 Diaphragm Gas Mask

The U.S. Army M3 Diaphragm Gas Mask was produced in gray (green) rubber, first with black metal parts and later with blue/green metal parts.  This example was made by General Tire & Rubber in 1941.

PATENT

 

Similar masks in my collection:  U.S. Army M3A1 Diaphragm, U.S. NORBA Type A-3, U.S. ND Mk IV

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