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Teacher Invents Emergency School Door Lock
An Iowa teacher invents a school door lock, which is designed to be installed in seconds, to keep dangerous intruders out of classrooms. KWQC's Tiffany Liou reports.
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An Iowa teacher invents a school door lock, which is designed to be installed in seconds, to keep dangerous intruders out of classrooms. KWQC's Tiffany Liou reports.
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