Finding companies

The thomas register is a listing by product of most
manufacturing firms in the US many libraries will have this in reference
section, often a year or two old copy donated by a local business that
needs the up to date version.

On line at

You must register to use on line (free) and both print and e-versions are
geared more to industrial users, but you can find lots of info within
these limits

there is also a thomas register europe for our overseas members any search
engine should turn it up rapidly