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'Subserver' is invented to solve this problem by manipulating not only the muscles on the forearms but all the muscles on the whole arm. It is formed to isolate the shoulder and to embrace the elbow in order to obtain a support of the elbow's strength as well.
Subserver helps users when pulling objects. In the near future, subserver will become an essential equipment in construction industry.
Asan-si, South Korea
Hyo chae Jeong,
Min chul Kim,