dunlop owns slazenger, carlton, and one other company i think. carlton makes top notch racquets, so you can be assured that the quality will be passed on from one brand to the next...
Dunlop They do make their own brand of badminton rackets, but these don't seem to be popular in most European countries or in the states. Malaysia seem to sell a lot. I own a couple, bought in 2005, both all HM graphite with titanium mesh. Nothing special in terms of performance, but solidly built. Look like they'd last forever. Interestingly, they come from the factory with Gosen strings and with a spare set of grommets. I wonder if they are made in the same factory?