Work in confined spaces
Keep in mind the "Ten Musts"
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Work in confined space, pay attention to these! 
Work in confined space, pay attention to these! Work in confined space, pay attention to these! Work in confined space, pay attention to these! Work in confined space, pay attention to these! Work in confined space, pay attention to these! Work in confined space, pay attention to these! Work in confined space, pay attention to these! Work in confined space, pay attention to these! Work in confined space, pay attention to these! Source: Ministry of Emergency Management of the People's Republic of China
