British patents abstracts.
Derwent Publications, Ltd.
London : Derwent Publications Ltd.,
1988-2001.
"Unexamined plus granted".
Issues also carry dates the abstracts were issued: 19 Oct. 1988-
Electric apparatus and appliances
Patents
British patents abstracts. Section El, Electrical
Derwent world patent abstracts. British patents. S-X, Electrical