A printing apparatus includes one of a first cartridge or a second cartridge. The first cartridge has a first contact array including a plurality of contact areas. The second cartridge has a second contact array including a plurality of contact areas. The locations of the contact areas of the first contact...http://www.google.com.au/patents/US20060256174?utm_source=gb-gplus-sharePatent US20060256174 - Interconnect circuit
