U.S. Navy Type 4 Comfo Respirator

The U.S. Navy Type 4 Comfo Respirator featured dual disc filters and a flutter valve.  MSA All-Dust filters were inserted inside the filter housing.  The approved assembly consisted of a BM-2101 facepiece and BM-2133 filters.  This example was made by Mine Safety Appliances in 1943.  Here it has been paired with MSA goggles (made in 1944), however it is not known whether these two items would have actually been used together.

PATENT

 

Similar masks in my collection:  U.S. NC-1, U.S. Army M1 Dust Respirator, NVA PK-1

Rubber stamps
Rubber stamps

Manufacturer, model, and Bureau of Mines stamps "MSA" "Comfo RESPIRATOR U.S. NAVY TYPE" "B.M. 2101

Stamp
Stamp

U.S. Navy anchor stamp

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Rubber stamps

Manufacturer and date stamps inside mask "9" "M.S.A." "1-43" "65"

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Rubber stamp

Stamp inside mask "MADE IN U.S.A."

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Rubber stamp

Patent stamp inside mask "U.S. PATENT NO. 2104016"

Rubber stamp
Rubber stamp

Patent stamp on flutter valve "PAT. NO. 1515645"

Rubber stamp
Rubber stamp

Date stamp on flutter valve "10-43" "20"

Stamp
Stamp

Stamp inside filter housing "CAUTION PLACE FILTERS IN LID AND SCREW ON TIGHTLY"

Box
Box

Box top view "M-S-A HALF MASK RESPIRATOR Equipped with ALL DUST FILTERS" "U.S. NAVY TYPE 4"

Rubber stamp
Rubber stamp

Stamps inside goggles "10-44" "U.S.A." "GR-S"

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Rubber stamp

Stamps on goggles strap "MSA" "6-44" "GRS"

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Rubber stamp

Stamp on goggles strap "P"