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United States Patent Design 324,069 “Lead Holder” (1989) 1990–1992

date of application
date granted
inventor
assignee
patent holder country
1990 April 9 (1989 October 19, Japan)
1992 February 18
Kazunori Katami
Tombow Pencil Co. Ltd.
Japan
patent employed on
Tombow 2.0 leadholder