A system made up of a portable information terminal mountable on a shopping cart for providing product and advertising information while the cart is moved inside a store and an external memory device connectable to the portable information terminal, the external memory device including a memory housing,...http://www.google.com.tw/patents/US8152062?utm_source=gb-gplus-share專利 US8152062 - Portable information terminal mountable on shopping cart and removable memory device usable with same
