FIELD: protective appliances. SUBSTANCE: protective helmet has inner and outer walls made in the form of enclosure and connected through openings. Helmet is manufactured from swollen plastic. Inner and outer walls and openings are made integral. Helmet is swollen from plastic sleeve within mold so as to cause sleeve to be molded within mold into double wall forming helmet. EFFECT: increased shock absorbing effect and simplified construction. 16 cl, 18 dwg
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