hard hat

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复数：hard hats

Hard hat
Hardhat
Hard hat
Hard hat outer shell having clear acrylic construction and internal illumination
Construction area (no hard hat required)
Is Field a Hard Hat Area? A Study of Violence in Field Placements
Hard hat detection in video sequences based on face features, motion and color information
Hard-Hat Detection for Construction Safety Visualization
Hard hat ear protector
The Hard Hat Riot: The Decline of New York City's White Working-Class and the Origins of the Reagan Democrat
An eyewear assembly for attachment to a hard hat
Ear muff accessory for safety hard hat
Caution! Hard Hat Area! Comprehension Under Construction: Cementing a Foundation of Comprehension Strategy Usage That Carries Over t...