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What do those diamond-shaped signs on buildings mean?
Episode 3 min 16s

What do those diamond-shaped signs on buildings mean?

From BrainStuff iHeartPodcasts
The National Fire Protection Agency, or NFPA, uses these signs to indicate hazardous materials stored in an unknown building. Listen in to learn how the signs work -- and how they help firefighters -- in this podcast from HowStuffWorks.com.

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