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hand held device handheld computer computer man male industrial plant engineer factory using digital tablet industry labour working mid adult man mid adult adult 35 to 39 years white caucasian only one man only men one mid adult man only mid adult men holding visual effect left to right pan panning 10 seconds or greater view point view medium shot technology machine high visibility clothing protective clothing vest safety goggles goggles eyewear hard hat helmet indoors alone one person multimedia Cross-Media high angle view elevated view above touch screen screen vat container real time protection