Apparatus for drawing ellipses
United States Patent 2996804
US Patent References:
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- - 0873291

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Inventors:
Hancox, Burton W.
Publication Date:
08/22/1961
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Assignee:
Hancox, Burton W.
Primary Class:
33/31
International Classes:
B43L11/055; B43L11/00
US Patent References:
1601779Drawing instrument
2326412Double divider
2452484Ellipsograph
2616181Drafting and measuring ruler
Foreign References:
DE68297C
DE80177C
DE587241C
GB561817A