German patents gazette.
Derwent Publications, Ltd.
London : Derwent Publications,
1968-1975.
Issues also carry dates the abstracts were issued, 25 Nov. 1968-30th Dec. 1975.
Merged with: German patents gazette. Section II, Electrical and, German patents gazette. Section III, Mechanical & general, to form: German patents gazette. Parts I-III complete.
Chemicals
Patents
German patents gazette. Section II, Electrical
German patents gazette. Section III, Mechanical & general
German patents gazette. Parts I-III complete