A rotating hair brush has several dividers between some of the rows of bristles. The dividers prevent hair from being tangled in the bristles as the brush rotates. The dividers also help smooth the hair and absorb and transfer back to the hair heat from a blow dryer. The dividers may be of many different...http://www.google.com/patents/US6098635?utm_source=gb-gplus-sharePatent US6098635 - Motorized, rotating hair brush
