A
HUMAN NECESSITIES
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A42
HEADWEAR
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A42B
HATS; HEAD COVERINGS
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3/00
Helmets; Helmet covers; ; Other protective head coverings;
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A42B3/04
Parts, details or accessories of helmets
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A42B3/06
Impact-absorbing shells, e.g. of crash helmets
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A42B3/063
using layered structures
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A42B3/064
with relative movement between layers
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