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Canadian Trade Index 
The Canadian Trade Index is a buyers guide to the products of over 30,000 industrial companies in Canada. It is an excellent source to use for finding manufacturers, exporters, distributors and service companies.

EUROPAGES 
Search by product, service, company, or industry sector on this database of 500,000 companies from 30 European countries.

HVAC Directory and Source Guide
A directory/sourcebook from HVAC News, a trade journal for the heating, air conditioning, and refrigeration industry. Find products and companies in this industry from this useful link. 

MacRAE's Blue Book  
MacRAE's is a website that connects buyers and sellers of industrial products. Find North American suppliers, distributors, and manufacturers of these products on this searchable database. 

Old House Journal’s Restoration Products Directory
Old House Journal’s Restoration Products Directory is a source “of products and services for homes built before 1950, as well as newer homes built in the traditional manner”, with “listings from over 2,000 companies”.

RN Database
A registered identification number, or RN, is a number issued by the Federal Trade Commission to a business residing in the U.S. that is engaged in the manufacture, importing, distribution, or sale of textile, wool, or fur products. The number is not required, but may replace the company name on a label or tag.

ThomasNet.com  
Search the Thomas Register of Manufacturers database of over 168,000 companies by product, service, or brand name for free.