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The Tape Measure can be rolled up because there is a spring inside the tape measure. When the measuring length is pulled out, the length of the ruler and the spring is actually stretched. Once the measurement is completed, the spring inside the tape measure will automatically contract, and the ruler will follow the action of the spring force. Shrink, so the tape will roll up.
Metric Tape Measure,Rolling Tape Measure,Automatic Tape Measure,Tape Measure Scale
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