Mounted on the dashboard of his patrol car, with its lens pointing forward through the windshield, a

Mounted on the dashboard of his patrol car, with its lens pointing forward through the windshield, a motion-picture camera belonging to Officer R. H. Galbraith of the California Highway Patrol took photographs of the automobiles he trails along the highways, making a permanent film record of any traffic violations for possible later use in court. -- source link

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