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Abstract technology radio wave signal illustration background 4k.
Worker wearing a safety vest and hard hat raises hand in a stop or directing gesture at a construction site. Heavy machinery is visible in the background, indicating ongoing work.
A person signaling to stop a bus at a park station, ready to board. Perfect for themes of public transport, travel, and city commuting.
Fire alarm siren with flashing strobe light and symbol sign on the wall in industrial warehouse or factory building. Emergency fire warning system equipment

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