An ink cartridge used in a color printer, comprises at the surface, a convexity or convexities (identifying section) that correspond to a color of an ink, and that can be identified by tactile sense. A cartridge setting section of the color printer comprises at the surface, a convexity or convexities...http://www.google.de/patents/US20050128257?utm_source=gb-gplus-sharePatent US20050128257 - Electronic device, replacement part thereof, package of replacement part, and method for arranging identifying section
