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two, polar, bears, top, icebergs, night, polar bear, glass, bear, animal

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multipier, tube, photon, measurement, amplifier, amplification, science, measuring, rca, glass

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5202x3468px

multiplier, tube, photon, measurement, amplifier, amplification, science, measuring, rca, glass

Public Domain
5202x3468px

multiplier, tube, photon, measurement, amplifier, amplification, science, measuring, rca, glass

Public Domain