সাঁচ:Chembox NFPA
অৱয়ব
| NFPA 704
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![NFPA 704 four-colored diamond](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6f/NFPA_704.svg/80px-NFPA_704.svg.png)
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Usage
[সম্পাদনা কৰক]See also
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