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Circuit diagram of a vibrator coil, with its parts labelled, vintage line drawing or engraving illustration.
Lucida Mr. Nachet adopted under the microscope, vintage engraved illustration. Industrial encyclopedia E.-O. Lami - 1875.
Customer online feedback and rating concept. Vector flat cartoon illustration for web landing page, banner, poster design. Diversity people with rate stars make review.
little schoolgirl in white gown looking through magnifier on reagents in chemistry lab
teenager boy make chemical experiments with reagent close up photo
An experimental set-up, to illustrate, a lamp ground detector for a three-wire circuit, with its parts labelled, vintage line drawing or engraving illustration.

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