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Since I do this for a living, perhaps I can give you some advice.
If you call the companies directly and ask for this information, you're not going to get very far. Most companies keep their specific numbers quiet.
The best way to go about it is to talk with other companies in that market and find out: a) the size of the total market (total revenue), and b) market shares of the various competitors in the market. You can then build a model that is a very close approximation of what the specific company's revenue is.
Keep in mind that this applies to revenues, and to one specific product. If you're talking about different products, you may have to talk to somebody else in the company to get market information for that product.
The best people to talk to are: Product Managers, VP Sales, VP Marketing
I hope this helps... Cheers!
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