and a one pound bolt dropped forty feet did not dent the cap. The helmet could carry a regulation bracket for a carbide lamp, and could be ordered in any size. Edward W. Bullard continued to improve ...

Either the “Hard Boiled” brand of helmet made by E.D. Bullard Company in San Francisco, California, or the plastic Skullgard or Comfo-Cap manufactured by the Mine Safety Appliances Company of ...