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5 天
on MSN
How bike helmets have evolved over the past two centuries
The first head protection concept introduced to the biking world was a hat made from pith, which is the spongy rind found in ...
insider.si.edu
5 个月
Mining Lights and Hats Helmets
But in 1919, Edward D. 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 ...
来自MSN
13 天
Helmets & Hard Hats: Emergency Head Protection Prep
'Otherworldly' crash site discovered on surface of Mars by NASA helicopter 3 Little-Known Perks of Having a Credit Score of ...
Yahoo
6 天
The evolution of bike helmets: From plant rinds to high-tech materials
In the beginning, there was the pith helmet. The first head protection concept introduced to the biking world was a hat made ...
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