Copper cathode.
Copper anodes and cathodes.
Copper cathode.
Copper cathode.
Copper cathodes.
Copper cathodes .
Copper cathodes.
Copper cathodes.
Copper cathode.
Copper cathode.
Copper cathode.
Copper cathode.
Copper cathodes.
Copper cathodes.
Copper cathodes.
Copper cathode.
Copper cathodes.
Copper cathodes.
Copper cathodes, iodine crystal.
Copper cathodes (electrolytic grade), min.