Patent classifications
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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A42B3/32
Collapsible helmets; Helmets made of separable parts; ; Helmets with movable parts, e.g. adjustable
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A42B3/324
Adjustable helmets
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