Belgian patents abstracts.
Derwent Publications, Ltd.cn
London : Derwent Publications, Ltd.,
1976-
From week X48 (12 Jan. 1977) to week 51 (1983) issued in 2 parts: Section CH: Chemical ; Sections P, Q, R: General, Mechanical, Electrical.
Includes patents granted prior to issuing date.
Description based on: Week W52 (3 Feb. 1976).
Patents
Derwent Belgian patents report