| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| HG 21522-1995 | English | 319 |
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Days<=3
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(Horizontal hanging cover plate welded flange manhole)
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HG 21522-1995
| Obsolete |
HG 21522-1995
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