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Based on your context, I'd suggest something like:
The drawings are organized clearly by manufacturer in a search tree type indexing system and are supplemented by piece list data such as type designations, article numbers, and weights
( this is assumimg they are talking about the archival of the actual drawings themselves. If, on the other hand, they are setting up a database containing information on the drawings, then I would definitely just use search tree and drop the indexing system part. In that case, the database is being created with drawing data organized with key field manufacturer and contain piece list information such as...)