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The PMK-4 (Russian: Противогаз Mалогабаритный Kомбинированный — "Compact combined mask") is the fourth mask in the PMK series. The PMK-4 is a panoramic full face mask with a speech diaphragm very similar to those on preceding PMK-series masks, and featuring a GOST 40mm filter inlet.On the first photo you can see pre serial mask with NBC hood and on other photo you can see serial versial of gas mask .