We should not speculate. Try calling them and see what they say. I'm sure they won't lie since they are a pretty big company. They should be able to tell you who owns them.
http://www.mbquart.com/2003/en_US/contact/
http://www.mbquart.com/2003/en_US/home/
They have also participated in the CES 2005 in Las Vegas, perhaps you can check with CES organizers on MB Quart's status.
With globalization, companies are being sold/bought, merged etc. Even the high-end Scan-speak driver manufacturer D-S-T (Danish Sound Technology) has just merged with Tymphany of USA, with I think Tymphany holding majority shares. This does not mean that the D-S-T factory has closed down. Just changed management.
Sometimes its for the better, sometimes not but the main thing is that the company has enough money to provide good support, maintain the equipment and machinery for production, R&D for future products etc.
Back to the topic. The only way to make sure you're buying originals is to buy from a known source. If you're buying from a shop (dealer), you can always call the local distributor for the brand and check if this shop is an authorized dealer. Some dealers may not take from local distributors but from third parties and the problem lies there as many of them do not even know they are stocking up fakes.
As for parallel importers or wholesalers that import directly from the manufacturer or other third parties, the only way is to seek referrals to ascertain their credibility. If asked, they should be able and willing to tell you the source of the goods. They should also be willing to stand behind the goods they sell and provide a refund or exchange if you are not satisfied or getting what you have paid for (an original product).
Ask questions if you're not sure. Bring someone that knows the product. Of course ask the right honest person and not those that can just speculate.