Protective headgear and method of making it

作者: Harry W Austin

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参考文章(12)
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Ploger Alfred, Stewart Robert, Molded tapered tubes and method of making same ,(1950)
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Fisher Joseph R, Hornickel Robert R, Protective helmet with shock absorbing suspension ,(1956)
Cecil A Sutphin, Juanita M Ward, Shoulder protector and garment strap holder ,(1948)
Howard E Shearer, Bust receiving and supporting member ,(1948)