| 摘要 |
A CLEANING ARTICLE INCLUDING AN AGENT OR REAGENT BOUND TO AN ARTICLE, SAID AGENT OR REAGENT BEING SLOWLY RELEASED FROM SAID ARTICLE IN USE; AND A VISUAL INDICATOR BOUND TO SAID ARTICLE, SAID VISUAL INDICATOR SELECTED TO PRESENT A CHANGE IN APPEARANCE INDICATIVE OF THE AMOUNT OF AGENT OR REAGENT REMAINING IN, OR RELEASED FROM, THE ARTICLE.
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