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A train travel supervision officer (PPKA) is giving departure permits on a train using green signs and whistling sounds to the train conductor
Brain and Body Connected by Nerve Signals 3d illustration
Telecommunications towers to distribute telephone signals and internet signals to reach all regions of the country comprehensively. It is a technological development. and communication organization.
Green traffic light at an intersection on a cloudy day. Road safety and transportation control signal. Urban street scene guiding vehicles and pedestrians.
Image of data processing over network and pixel globe on black background. Data, digital interface, connection, processing and global communication, digitally generated image.

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