His idea of using small , round dental mirrors to be mounted on headgear as safety devices was quickly accepted .
Headgear mounted mirrors were first developed in the early 1970s as a bicycle safety accessory by a dentist , Dr. Jack Greenlaw .
Jack Greenlaw 's idea of using small , round dental mirrors to be mounted on headgear as safety devices was quickly accepted .
Headgear mounted mirrors were first developed in the early 1970s as a bicycle safety accessory by a dentist , Dr. Jack Greenlaw .