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Priority to SG10201700471UApriorityCriticalpatent/SG10201700471UA/en
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SPRING USED IN MATTRESSES A spring used in mattresses for supporting weight of uses includes a first wire and multiple second wires which are snugly wrapped around in a spiral way so as to form a spring wire. The spring wire includes multiple coil portions which continuous and spirally extend along the axis of the spring wire. The coil portions each have the same diameter. FIG. 1