Some of the world's most distinguished modern architects have relied on copper.

In the case of halftone cuts, the work is done on copper.

After six hours, the particles were reduced on copper by 99.999%.

If used on copper, they will chew it up.

It also warned that exports were still too dependent on copper.

Samuel Cooper is said to have executed a few paintings in oil on copper.

A commercial "silver polish" often contains ingredients that will also work on copper.

A single fiber can carry up to 24,000 simultaneous conversations as against 24 on copper.

In conclusion, allow me to make a few comments on copper.

The same year the pacts on Chilean copper are signed.