Webster's Online Dictionary
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Date "HARDHAT" was first used in popular English literature: sometime before 1971. (references)

Specialty Definition: HARDHAT

DomainDefinition
MiningSlang term for a safety hat. (references)

Source: compiled by the editor from various references; see credits.

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Hardhat mounted mirror7   Hardhat mounted mirror7

Source: the editor, created by/for EVE to gauge likely levels of human interest in linguistically triggered topics (compiled across various sources, such as Wikipedia and specialty expression glosses).