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This version for d'helicopter pilots, it differs from the Air
force of Gueneau type 316 version by
its radio-system, its interior and by the presence of the chin strap with
a chin piece. It followed the Socapex type 403M3. It does not have oxygen
mask slot bayonet. The leather headband allows the fixation of night vision
equipment. A version without the leather headband type 317-1
also exits.
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