| http://www.w3.org/ns/prov#value | - The apparatus according to claim 5, wherein the sensor is a light sensor and a portion of the rear wall of the ink cartridge is transparent, the apparatus further including a light emitter emitting light whereby the light emitter illuminates the surface of the indicator with the light and the sensor detects light reflected from the surface of the indicator as the carriage reciprocates on the carri
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