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Zenith EC Metam RV-21 inverted binocular metallurgical microscope with differential interference contrast
Zenith EC Metam RV-21 inverted binocular metallurgical microscope with differential interference contrast, serial no.950098, with quadruple nosepiece fitted with four objectives, large x-y movement mechanical stage, lamp housing, AC power supply for lamp, and box of accessories, made in 1996