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Leadholder or Related Patent Thumbnail Index |
 http://leadholder.com/pat-us03097628-1960-keen_point.html |
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date of application date granted inventor assignee patent holder country |
1960 July 7 1963 July 16 Frank J. Stoeberl Dur-O-Lite Pencil Company United States |
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| patent employed on |
 Dur-O-Lite Keen-Point Drafting Pencil |
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