Derwent world patents index on STN Inernational
Subtitle: WPIDS, WPINDEX database description
By: Derwent Publications Ltd..
Contributors: Derwent Publications Ltd.
Series: Online user manual -- v.3
Publisher: Derwent Publns.
Published: 1993
Place of publication: London
Language: eng
Subjects: Patent searching.
Other titles: World patents index.