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Social & Preventive Medicine Demography and family planning 6d9fc696

In Cu 380A, 380 represents

A
Number of turns of copper wire
B
Surface area of CuT in sq.mm
C
Surface area of Cu in sq.mm
D
Effective life of CuT in quaers
High-Yield Explanation
The numbers included in the names of the devices refer to the surface area (in sq.mm) of the copper on the device. Metallic copper has a strong anti-feility effect.Park 23e pg: 496

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