US2007157478A1PendingUtilityA1

Professional compass rulers

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Assignee: LE CHI-MINHPriority: Jan 9, 2006Filed: Jan 9, 2006Published: Jul 12, 2007
Est. expiryJan 9, 2026(expired)· nominal 20-yr term from priority
Inventors:Chi-Minh Le
B43L 7/005B43L 13/002G01B 3/04B43L 9/007
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Claims

Abstract

A ruler for draws or measurements of circle, straigth line, and angle. The line drawing or measuring is sliding belong in the ruler's track; which is at middle and parallel on the ruler's length. These techniques are combined for a simple ruler.

Claims

exact text as granted — not AI-modified
1 . A combination of compass, ruler and protractor for drawing and measuring on the middle of the ruler's length.

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