| http://www.w3.org/ns/prov#value | - Although light detector 212 is shown as a bipolar transistor, it is to be understood that light detector 212 includes any number or types of elements, components or circuits that, individually or in combination, will detect light signal 210 and function with printer control or control mechanism 45 to enable printing by printing device 20 when detector 212 is coupled to source 200 and detects light
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