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Home › Reusable unit displaying a specific pattern and an image forming apparatus using the reusable unit when the specific pattern is displayed and rendering the specific pattern illegible when the reusable unit is exhausted

Reusable unit displaying a specific pattern and an image forming apparatus using the reusable unit when the specific pattern is displayed and rendering the specific pattern illegible when the reusable unit is exhausted

US Patent 6324350 · Granted Nov 27, 2001

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