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Live theater concert show sound video music control console with scene lights background. Sound
Chief Engineer of the Mechanical Plant Conduct inspection of the sterilization machine tunnel.
Two classmates making copies of famous buildings model
Teacher and his pupil polishing up a robot
Happy boy attending his school science class
Enthusiastic schoolboy building figures with construction set
Concentrated schoolboy turning on a helicopter model
Boy and girl looking for details before building
Pupil grabbing construction set details before bulding
Bright construction set standing in front of pupils
Girl helping her classmate constructing a robot
