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Continue to ChatIS 3764 -1992 INDIAN STANDARD EXCAVATION WORK-CODE OF SAFETY. https://civilengineer.co.in/indian-standard-codes/is-3764-1992-indian-standard-excavation-work-code-of-safety/
IS 3764 -1992 INDIAN STANDARD EXCAVATION WORK-CODE OF SAFETY. https://civilengineer.co.in/indian-standard-codes/is-3764-1992-indian-standard-excavation-work-code-of-safety/