German patents abstracts.
Derwent Publications, Ltd.
London : Technical Information Co.,
1960-1977.
Title from cover.
Imprint varies.
Issues also carry dates the abstracts were issued,   - 5 Jan. 77.
Patents
German patents gazette (London : 1956)
German patents abstracts. Section Ch, Chemical
German patents abstracts. Sections P, Q, R, General/mechanical/electrical