EI Compendex, an index of engineering materials started in 1884, now published by Elsevier.

The name "Compendex" stands for COMPuterized ENgineering inDEX.Compendex currently contains over 9 million records and references over 5,000 international sources.
Approximately 500,000 new records are added to the database annually from over 190 disciplines and major specialties within the engineering field.
Coverage is from 1969 to the present, and is updated weekly.