পেনের কালিতে এই রকম জেল থাকে কেন? জানুন অবাক করা তথ্য | WHY LIQUID IS INSERTED IN GEL PEN REFILLS? 

পেনের কালিতে এই রকম জেল থাকে কেন? জানুন অবাক করা তথ্য | WHY LIQUID IS INSERTED IN GEL PEN REFILLS?
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