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3. Attention to using:
The solder wire may not be cleaned(if being cleaned, the period
of antirusting will be longer). We can pack the product with non-coated
wax side paper, then closed the product with plastic, plastic knitting
bag. For protecting the metal from rusting, if the paper is broken,
don't use it. After using, the rest of it should be put away in
dry and cool condition.
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