In this paper, we introduce a practical information retrieval system using Termatrex Equipment, which was installed as a link in the chain of our Engineering Reports IR System. This retrieval system, called optical coincidence one, checks cards by light, and a card for indexing one document can store 10,000 addresses of information. This indexing uses descriptors of EJC's thesaurus. We can retrieve information bv terms, category fields, our company's divisions, or these combination.
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