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| firefighter's helmet ： ウィキペディア英語版 |
firefighter's helmet
For centuries, firefighters have worn helmets to protect them from cold, cinders and falling objects. Although the shape of most fire helmets has changed little over the years, their composition has evolved from traditional leather to metals (including brass, nickel and aluminum), to composite helmets constructed of lightweight polymers and other plastics.
==Leather helmets==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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