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100 | 1 | _aFen, Zheng | |
245 | 0 | 0 | _aAnalysis of the properties of the International Patent Classification |
650 |
_aInternationale Patentklassifikation _92098 |
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773 | 0 |
_aWPI. 9(1987),3,152-156. _wz_WPI |
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_c6784 _d6784 |