Vietnam, there are very few hospitals use of devices responsive to all vacuum tubes. so, they must open the lid by hand and pumps blood into the tube. so, if using the test tube with the lid according to your design, they will take more time. for example, at children's Hospital in Vietnam, the number of patients very crowded, they use a test tube by hand, they want the lid must be opened easily possible. Therefore, I want you to replace the lid as the lid of my pattern new
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