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Background made of various alkaline and lithium-ion batteries, positive pole visible.
Anaerobic purple and red Photobacteria cultures in a microbial fuel cell, with infrared illuminators
Background made of various alkaline and lithium-ion batteries, positive pole visible.
lamp on the white background
Background made of various alkaline and lithium-ion batteries, positive pole visible.
heating element of water heater with scum and sediment isolated on white background