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United States Patent 4,124,048 "Lead Sharpener" 1977

date of application
date granted
inventor
assignee
patent holder country
1977 June 21 (1976 July 7, W. Germany)
1978 November 7
Ernst Fischer
Möbius and Ruppert KG
Germany
patent employed on Koh-I-Noor Lead Pointer 992WC