In the photo two hard hats can be seen. A blue one on the bar top and one perched atop Joe Biden’s head. The one on the bar top is clearly sitting with the front facing away from the camera ...

Prior to the 1920s, miners wore a soft cap made of cloth or canvas with a leather brim and lamp bracket to hold their light. But in 1919, Edward D. Bullard of San Francisco, California developed the ...