Engraving depicting high voltage x-ray equipment; x-ray tube on right; Ruhmkorff high voltage coil on left. In between are glass covered diodes that act to give a direct current only to the x-ray tube. Dated 19th Century ©UIG/Leemage

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TOP29624904

Source:

達志影像

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RM

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須由TPG 完整授權

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