101. In 1919, the Hard-Boiled Hat was created by Bullard, a San Francisco based company, to protect miners and other workers from objects falling on their heads. Hats such as this one were used d …

101. In 1919, the Hard-Boiled Hat was created by Bullard, a San Francisco based company, to protect miners and other workers from objects falling on their heads. Hats such as this one were used during the building of Hoover Dam.