:

I think they are referring to trade groups and associations, take a look here:

http://en.wikipedia.org/wiki/Trade_association
http://www.wisegeek.com/what-is-a-trade-association.htm

An association can be empresa, sociedad as well, as in asociación comercial.

Hope this helps.

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de M Donnelly
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Note added at 9 hrs (2009-07-09 22:08:06 GMT)
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Saludos :))