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Longjia is also one of the top ten anti-theft door brands. I guess it's an installation problem.
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There are several levels of security doors.
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Just go straight to the landlord.
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Yes, if you look at your sales contract, there is a warranty period, and during the warranty period, it is generally the developer, the builder or they entrust the property company to be responsible for the repair.
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What are you going to do in this factory? security guards two or three thousand; about 3,000 general workers; Technology and sales are different ...