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An induction coil, receives a large current of small electromotive force and delivers a small current at a high pressure, vintage line drawing or engraving illustration.
Alchemist, vintage engraved illustration. From the Universe and Humanity, 1910.
A typical representation of the method of measuring insulation resistance, vintage line drawing or engraving illustration.
Checking the chemical formula in school laboratory
Photo of books and light bulbs with shining fibers in a shape of Education concept word isolated on black background.

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