Differentiated product design is achieved by changing the counting principle. Iterating the disadvantages of the old counting screen following the wheel rotation is more in line with the manpower effect in the process of abdominal health.
Development and Design of New Products of Healthy Abdominal Wheel
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Hello, do you take the product design
This design is good.
Abdominal muscle training is really great and easy to use.
This thing is really, most people can't understand it.