A hard hat mounted mirror is a safety device attached to a hard hat that provides an increased field-of-view. == History == Headgear mounted mirrors were first developed in the early 1970s as a bicycle safety accessory by a dentist, Dr.
A hard hat mounted mirror is a safety device attached to a hard hat that provides an increased field-of-view. == History == Headgear mounted mirrors were first developed in the early 1970s as a bicycle safety accessory by a dentist, Dr.
Source: Wikipedia "Hard hat mounted mirror" · CC BY-SA 4.0
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