German patents gazette.
Derwent Publications, Ltd.
London : Derwent Publications,
1976.
Formed by the union of: German patents gazette. Section I, Chemical, and: German patents gazette. Section II, Electrical, and: German patents gazette. Section III, Mechanical & general.
Split into: German patents gazette. Section Ch, Chemical, and: German patents gazette. Sections P, Q, General/mechanical, and: German patents gazette. Section R, Electrical.
Patents
German patents gazette. Section I, Chemical
German patents gazette. Section II, Electrical
German patents gazette. Section III, Mechanical & general
German patents gazette. Section Ch, Chemical
German patents gazette. Sections P, Q, General/mechanical
German patents gazette. Section R, Electrical