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JeffC
Nothing suprising about this list, it's the usual suspects (IMO) - but not the innovators that are changing this space. SupplyFrame (http://www.supplyframe.com) is a vertical media site that is focused in the B2B space of electronic components. We (I work there) have a very fast growing site in terms of audience and advertisers created to help electronics manufacturers and distributors reach out and influence global on-line electronics designers. What separate SupplyFrame from the usual directory listing sites is a dedication to pay-for-performance marketing and a syndication strategy that reaches a global audience.
The flaw in your approach is assuming that a search for the keyword 'b2b search engine' or 'industrial search engine' is going to turn up the big list you hoped. This approach might find sites in the consumer world but in B2B the searches are much more focused. As you know, sites need to optimize around terms their target audience seeks - not what press and bloggers are searching. If our audience searched on 'industrial search engine' well, frankly, they aren't a qualified audience for our B2B search engine! Now if you had thought to search on a relevant term like 'ac transformer datasheet' that would be music to my ears.
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Story: The Big List Of Major B2B Search Engines