Bullard of San Francisco, California developed the first hard hat, basing it on the Doughboy helmet he wore as a soldier in World War I. The helmet was made of canvas, glue, and black paint, and given ...
来自MSN2 个月
From using plant rinds to high-tech materials, bike helmets have improved significantly ...and companies continue to develop new and innovative materials. In the beginning, there was the pith helmet. The first head protection concept introduced to the biking world was a hat made from ...
Americans across the board need more education into the prevention of concussions, especially how hard hats and helmets can help prevent such injuries. Consumer-survey company Nielsen was ...
一些您可能无法访问的结果已被隐去。
显示无法访问的结果