See How This Simple Invention Can Save Your Child’s Life | American Overlook: "wa teachers concerned with the potential for a shooting at their school are taking action with a new invention that will help keep teachers and students safe.
“The Sleeve” is a 12-gauge carbon steel case that holds up to 550 pounds of force. When placed over a door’s arm, it prevents intruders from getting into the classroom."
'via Blog this'
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