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- editor's%3a%22Coopmans%2c C. et al.%22 2
- editores%3a%22Coopmans%2c C. et al.%22 2
- editors%3a%22Coopmans%2c C. et al.%22 2
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Einführung in die Handhabung der Internationalen Patentklassifikation (1977)
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- Al 12b Pat
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Rauhut, H.: Regeln für das Register der Systematiken : 2. Fassung (1975)
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- Al 12b Sys -Kon-