Mathematics, 18.04.2020 05:56, Shadow0202

In 1930, these workmen either went bareheaded, wore a cloth cap—often worn backward—or wore a battered felt hat. The rigid plastics needed for molded head protection, called "hard hats," would not appear until after World War Il.

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In 1930, these workmen either went bareheaded, wore a cloth cap—often worn backward—or wore a batte...