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The great-granddaughter of inventor Edward Bullard visits the exhibit dedicated to his invention, the hard hat, at the National Inventors Hall of Fame Museum (Photo courtesy of the National Inventors Hall of Fame)

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The great-granddaughter of inventor Edward Bullard visits the exhibit dedicated to his invention, the hard hat, at the National Inventors Hall of Fame Museum (Photo courtesy of the National Inventors Hall of Fame)

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The great-granddaughter of inventor Edward Bullard visits the exhibit dedicated to his invention, the hard hat, at the National Inventors Hall of Fame Museum (Photo courtesy of the National Inventors Hall of Fame)