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If you have chairs (and doorknobs) like this in your classroom, here's a tip on how to barricade your room in a matter of seconds. | By Tier One Tactical SolutionsFacebook

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Block classroom door with chair amid Texas school shooting

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Block classroom door with chair amid Texas school shooting

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Block classroom door with chair amid Texas school shooting

Block classroom door with chair amid Texas school shooting

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Get The Right Lockdown Solution for Classroom Doors

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