Patterson Companies Inc is a medical supplies conglomerate primarily in the business of veterinary and dental products (ranging from xray equipment to consumable products, dental consumables make up the biggest part of the dental industry). Since 2003, it has also distributed general medical rehabilitative devices like braces and wheel chairs. Traditionally a dental company, it diversified its business at the turn of the millennium when it acquired 55-year-old company, JA Webster Inc, a distributor of veterinary products. That business segment (now known as Patterson Veterinary) currently distributes equipment (diagnostic and surgical) and medicine (anaesthetics, vaccines). The company operates directly in only the US and Canada (in Canada through subsidiaries Sammons Preston Canada and Patterson Dental Canada). In 2008 it was noted as having one of the lowest debt ratios among companies in the health care sector. Patterson was also a member of the Nasdaq-100 until December 10, 2010 when it and six other companies were replaced. The Nasdaq-100 is composed of the 100 largest non financial stocks traded on the Nasdaq. On June 17, 2010 Patterson Medical purchased the rehabilitation part of Ireland-based DCC Healthcare (Days Healthcare, Physiomed and Ausmedic) in a move that increased Patterson Medical’s revenue by 16.43% (US$70 million, fiscal year ended April 24, 2010). The new companies were added to its Homecraft Rolyan unit in the UK.