Einführung in die Handhabung der Internationalen Patentklassifikation (Int. Cl.)
Year of publication: |
1977
|
---|---|
Institutions: | Deutschland <Bundesrepublik> / Patentamt (contributor) |
Publisher: |
Köln : Heymanns |
Subject: | Patent |
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Büttner, Heinrich, (1961)
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