There are different Business Directories :

Try all different Business Directories offered by
Every Engine has different results,
Most companies are listed in serveral directories
but the results are not the same ...

Find Products
find products and order them directly (example Cosmetics, Jewels, Bags)

Product Yellow Pages by Amazon

Video about the Amazon Pop Up Store @ Cremerie de Paris
one of the World's most famous places for Brand Expos
and historic home of the Estonian Whitepages.

Find Products / Companies via Yellow Pages B2C
Business to Consumers
Companies froviding Products or Sevices for End Users
(example Restaurant)

no classic yellowpages

Find Products / Companies via Yellow Pages B2B
Business to Business
Companies from Estonia providing Products for Professionals
(example Machines)

Find Company Info via Financial Yellow Pages
Financial Infos
Contact Details (only in Estonian)

Find Companies via Gov Pages
search through the Government
Government of Estonia
Estonia Gov Search
this search engine goes through
the Estonian Gov Portal
all the Estonian ministeries,
maybe the company you are looking for
has been mentioned at some point.

Find Companies in other Countries
search in another country
Phone Book of the
Phone Book of the
Annuaire du
maybe the person you are looking for has moved
and can be cound through the directory of another country

good luck ...