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| 100 | 1 | _aHäußer, Erich | |
| 245 | 0 | 0 | _aThe Use of Patent Information for the Identification of Development Trends |
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_aPatentdokumentation _93575 |
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_aPatentdokumentation _93575 |
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_aTechnologie _94394 |
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_aPatentwesen _93556 |
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_aWPI. 1(1979),2,73-76. _wz_WPI |
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