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Next to the students to study, always there is a tumbler.
When I was studying, it is the number of days to dry the body.
However, even to go have a cup of hot tea.
There is a human desire to want to drink cold water.
Or it may not come in response to a separately out with water for the students to concentrate only in one place
I was thinking a structure that can easily drink.
Existing tumbler, but prototype there were many, we designed in rectangular with rounded the combined two of the triangular prism. Remove also possible, if necessary, it is portability convenient.
Daegu, South Korea