| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| GB/T 20939-2007 | English | 1394 |
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Days<=7
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Structuring principles for technical products and technical product documentation -- Letter codes -- Main classes and subclasses of objects according to their purpose and task
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GB/T 20939-2007
| Valid |
GB/T 20939-2007
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