Before I say any thing about this site, I must tell you that it is not a free resource, it charges you for its information.
Tech street is a resource for Industry codes and standards, you can dig for standards issued by IEEE for example.
Mainly, people working in the industrial sector or researchers working on manufacturing a certain product, and need to produce it according to certain standards, will benefit from such a site.
It also contains tools to manage the information you might need for such purposes.
Start by downloading free previews, techstreet fact sheet, or any thing you might find free :)