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While measuring with a ruler, we usually need to aim the start point of the ruler at the thing you want to measure, so we improve the ruler by combining the L shape hook from the tape measure. Therefore, the angled ruler is created. It can easy to aim the start point of the ruler at the thing, and help you measuring.
National Taiwan University of Science and Technology
Taipei, Taiwan
Hsien-Hui Tang
National Taiwan University of Science and Technology
Taipei, Taiwan
Chung-Ping, Lai
Ming-Hong, Yeh