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.
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.