| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| HG 21597-1999 | English | 239 |
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Days<=2
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(Rotary arch steel manhole cover open soon)
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HG 21597-1999
| Obsolete |
HG 21597-1999
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