Title:
Automatic pencil
United States Patent 1621990
Inventors:
Lippert, Leo H.
Ragnvald, Bergeson
Publication Date:
03/22/1927
Export Citation:
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Assignee:
Lippert, Leo H.
Ragnvald, Bergeson
Primary Class:
401/73
Other Classes:
401/85
International Classes:
B43K21/08; B43K21/00
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