where can i get information about what companies supply other companies with goods and services?

Answer 1

If you want a list of companies supplying a particular PRODUCT, you need to go no further than the Thomas Register:

http://www.thomasnet.com/

If you want a list of key suppliers for a particular COMPANY, you'd have to dig through newpaper clippings, call the company's investor relations department (if it has one), or buy this data from someone like Revere Data:

http://www.reveredata.com/products/rrelationships.shtml

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Answer 2

Your question is too broad.

To get the answer you need, you need to specify an industry, a type of business, etc.

Every business offers goods and/or services, whether it is a dentist, steel producer or importer.

Answer 3

Request B2B (business to business) yellow pages from your local telephone company