Where can I find what companies a Publicly listed company sources from? E.G. Who does GE Healthcare source from?

What SEC form would I need to read? What would I be looking for in that form? Can I call GE and ask directly?

A better example might be - Who does GE Healthcare source chillers from?

Submitted February 03, 2015 at 05:15PM by jonwachob91 http://ift.tt/1u40HdH