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2015-07-21

Patron saint---helmet

Patron saint---helmet

Helmet prototype, can be traced back to primitive society. Primitive time when hunting or gang fights, sometimes on top of pieces of bone, shell, shells, twigs, skins, etc. mess. Perhaps in order to force, but plays a role in protecting the

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2015-07-15

why need use the special climbing helmet for climbing?

why need use the special climbing helmet for climbing?

Whymountainclimbingneedwearspecialhelmet?ProducedinEuropededicatedmountaineeringhelmetsmustpassthroughtheEuropeanUnion(CE)orstandard/andUIAAs.InEurope,theEuropeanUnionrequiresthatallhelmetssoldinthemarketthroughstandardtestsofCE.IntheUS,the

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2015-07-10

Comprehensive introduction to the bicycle helmet

Comprehensive introduction to the bicycle helmet

Helmet is an essential part of riding equipment, that how to discern the stand or fall of helmet? Can from the following reference: Standard: including quality, weight, lining, wearing comfortable, air permeability, the effect of wind resis

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