I see this often for industrial websites like yours. Every time it usually has to do with the lack of content on pages that are under performing. Where Google relies heavily on IBLs (internal and external) other SE's like MSN and Yahoo look at content much more. Try adding more content to your pages. Most just are pages full of links right now.

Also are you even selling products yourself on this website or is it simply made to get advertising revenue from AdSense and other banners?

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