B43K 3/04

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
4761090 Tubular writing pen tip with adjustment meansJul 31, 86Aug 02, 88Koh-I-Noor Rapidograph, Inc., ROTRING-WERKE RIEPE KG, A GERMAN FIRM,
4662769 Tubular writing pen tip with adjustment meansMay 22, 85May 05, 87Koh-I-Noor Rapidograph, Inc.
4573820 Applicator tip assembly for a pen-like instrumentJul 02, 84Mar 04, 86Minnesota Mining and Manufacturing Company
4364684 Writing instrumentJun 11, 80Dec 21, 82PENTEL KABUSHIKI KAISHA