copper
Tuesday, May 14, 2013
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copper
,
hysical
,
haracteristics
,
opper
,
metal
,
with
,
atomic
,
number
,
copper
,
crystal
,
exceptional
,
current
,
carrying
,
capacity
,
more
,
efficient
,
natcopper
,
have
,
questions
,
about
,
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