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Are you having problems with measuring curve?
A "Two Way Tape Line" is a fascinating integration of existing steel ruler and thin thread-ruler, and it is designed in order to measure the length of curved surfaces more easily and accurately. This thread-ruler covers any curved sufraces, efficiently measuring as well as rotating like a protractor.
Hoseo University
Asan, South Korea
Hoseo University
Asan, South Korea
Da eun Kim
Hoseo university
Pohang, South Korea
Da bin Kim
Hoseo university
Suncheon, South Korea
Won Heo