An ink cartridge has a label portion on a wall surface of one periphery of a case forming an ink accommodating unit. The first and wheels are disposed compressively about a wire feed region, and the first and wheels are drivingly coupled together to output substantially equal tangential in the wire feed region. The optical data may be routed in a manner that allows for multi-fiber transmissions with one fiber dedicated to uphole transmissions and another dedicated to downhole transmissions. The scenario associator is configured to associate the event data with a plurality of scenarios. The second indicating section indicates a quantity that is less than or equal to the quantity indicated by the first indicating section.