Sign up for an Award
Participate with your entry in one of our professional or student awards.
Sign up for an awardLearn more:
Unsupported browser
You are using an outdated browser. Please upgrade your browser to improve your experience.
Sometimes we touch the pen that is put on the table, so it fall on the floor.
In order to do not roll over, I suggest that pen dont roll according to tumbler principle.
Its a base of RPPs Design
Chonbuk National Univ
jeonju, South Korea
kim tae ho
Chonbuk National Univ
jeonju, South Korea
jae uk Kim, taehyun Kim