The IMB was the twin-mask of the IMA.
Mask overview[]
Visually they are almost the same except for placement of stamps, where the IMB has the size on the forehead instead of on the cheek. The color might also be different, but this is minute. It also has a iron mesh in the exhale valve. The purpose of this is unknown. The mask featured PVC visor design. It has a carrying strap so the mask can hang from your neck when not in use.
Filter[]
It come with a Helly Hansen NBC filter, as they also made filters.
Bag and kit[]
The IMB was been distributed with a carrier bag of the same colour with a manual and filter packed in foil. It was made for industry (though some sources suggest the military) as seen on the exhale valve. The sticker says 'Godkjent av direktoratet for arbeidstilsynet', meaning 'Approved by the Directorate of Labor Inspection'.
