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This is a portable pump, the gas is blown with the mouth, just follow the instructions barometer, you can put the ball inflated to a standard pressure.
National Yunlin University
of science & technology
Douliu, Taiwan
National Yunlin University
of science & technology
Douliu, Taiwan
Graduate school of design ,Master program
Wei-Chung Wang
Grad school & dept of creative design
Meng-Hui Lin