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Automatic restraint apparatus of fire door for fire fighting
Automatic restraint apparatus of fire door for fire fighting
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机译:消防防火门自动约束装置
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摘要
More particularly, the present invention relates to a fire-prevention door automatic restraint system for fire fighting, and more particularly, to a fire-prevention door automatic restraining device for fire, To thereby form a differential pressure state in the smoke-inducing section.
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