5. annual expiry date of project:Teens shelf works designed is 30 years (grade 3).6. details of maintenance works:the warranty process: within 2 years after entering service, the contractor will conduct maintenance works in accordance with regulation DD • issued.maintenance process works: the basis of recovery of recyclable materials of Dong HA. needs to be applied at all 3 modes of prescribed maintenance are:-regular maintenance.-periodic maintenance.-unscheduled maintenance.
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