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| 世界专利索引英国杂志名 | |||
| 世界专利索引 | |||
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| 世界专利索引 | |||
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| 国际专利索引 (WPI) | |||
| English thesaurus | |||
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| W | |||
| W.P.I. | |||
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world patents index : 1 phrase in 1 subject |
| Telecommunications | 1 |
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