Period

5 results for: copper compound

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Close-up of copper connections in an electrical cabinet, switch cabinet construction, PV system
BRK26G60_151

Close-up of copper connections in an electrical ca...

Application of high voltage current, electrolysis of black copper: Process for purifying or
BRK26B55_472

Application of high voltage current, electrolysis ...

Head of a German vespula germanica
BRK22I27_026

Head of a German vespula germanica

Head and thorax of a German vespula germanica
BRK22I27_017

Head and thorax of a German vespula germanica

Portrait of a German vespula germanica
BRK22I27_016

Portrait of a German vespula germanica