Title:
Mechanical lead pencil with finger operable lead projecting and retracting means
United States Patent 2583069
US Patent References:
Mechanical pencil
- - 2219769

Writing instrument
- - 2428854


Inventors:
Vojtech, Votruba
Publication Date:
01/22/1952
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Assignee:
KOH I NOOR TUZKARNA L & C HARD
Primary Class:
401/65
Other Classes:
401/80
International Classes:
B43K21/20; B43K21/00