Derwent world patents index.
Thomson Reuters,issuing body.
Clarivate,issuing body.
Philadelphia : Thomson Reuters
Description based on print version record.
Latest issue consulted: edition 12, published in 2022.
Information storage and retrieval systems
Information storage and retrieval systems
Information storage and retrieval systems
Information storage and retrieval systems
Information storage and retrieval systems
Derwent world patents index. DWPI classification
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