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gan weinyddwr ar 21-11-01
The fire sprinkler system is divided into closed fire sprinkler system and open fire sprinkler system. Different types of systems have different working principles of sprinkler heads. Today, the fire sprinkler manufacturer will talk about the difference between these. A...
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gan weinyddwr ar 21-11-01
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Tarwch Enter i chwilio neu ESC i gau
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