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United States Patent 2,063,637 “Mechanical Pencil”, 1935–1936

date of application
date granted
inventor
assignee
patent holder country
1936 January 22 (1935 February 15 in Switzerland))
1936 December 8
Max Stössel

Switzerland
patent employed on
US 2063637 page 1
US 2063637 page 2
US 2063637 page 3