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Whether by natural or manmade disasters, classrooms can be forced into lockdown mode. For safety reasons, students may need to remain in the classr...

Whether by natural or man-made disasters, classrooms can be forced into lockdown mode. For safety reasons, students may need to remain in the class...

Whether by natural or man made disasters, classrooms can be forced into lockdown mode. For safety reasons, students may need to remain in the class...